Multiple dropdown

I have a page with menu. But I want in one menu a mulitple dropdown, but it doesn’t work. Can you help me

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> 
<!--<meta http-equiv="refresh" content="0; URL=constructie.html" /> Dit veranderen als pagina's online mogen-->

<title>Webmenu Survival</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <style type= "text/css">
        <!--
        /* @group Blink */
        #blink {
            -webkit-animation: blink .75s linear infinite;
            -moz-animation: blink .75s linear infinite;
            -ms-animation: blink .75s linear infinite;
            -o-animation: blink .75s linear infinite;
            animation: blink .75s linear infinite;
        }

        @-webkit-keyframes blink {
            0% {
                opacity: 1;
            }

            50% {
                opacity: 1;
            }

            50.01% {
                opacity: 0;
            }

            100% {
                opacity: 0;
            }
        }

        @-moz-keyframes blink {
            0% {
                opacity: 1;
            }

            50% {
                opacity: 1;
            }

            50.01% {
                opacity: 0;
            }

            100% {
                opacity: 0;
            }
        }

        @-ms-keyframes blink {
            0% {
                opacity: 1;
            }

            50% {
                opacity: 1;
            }

            50.01% {
                opacity: 0;
            }

            100% {
                opacity: 0;
            }
        }

        @-o-keyframes blink {
            0% {
                opacity: 1;
            }

            50% {
                opacity: 1;
            }

            50.01% {
                opacity: 0;
            }

            100% {
                opacity: 0;
            }
        }

        @keyframes blink {
            0% {
                opacity: 1;
            }

            50% {
                opacity: 1;
            }

            50.01% {
                opacity: 0;
            }

            100% {
                opacity: 0;
            }
        }
        /* @end */
        -->
    </style>

<style type="text/css">

body {background-color: yellow;
    }

.image {background:url(banner.jpg) no-repeat;
		background-position:center;
		height:100px;
        }

.image .text {position:relative;
			  top:10px; 
			  left:10px;
	          color:white;
	          text-align: center;
	          }

ul {padding:0;
	margin:0;
	list-style-type:none;}
	
a {text-decoration:none;
   color:white;
   background-color:purple;
   border-right:1px solid white;}



ul{
margin:0;
padding:0;
}

li{
display:inline;
list-style-type:none;
}

a.glidebutton{
display: inline-block;
position: relative;
color: #4A4A4A; /* default color */
background: #ececec; /* default bg color */
text-decoration: none;
font: bold 14px Arial; /* font settings */
letter-spacing: 2px; /* font settings */
overflow: hidden;
height: 30px; /* height of each button */
text-align: center;
border-radius: 5px; /* border radius */
-moz-transition: all 0.3s ease-in-out; /* Enable CSS transition between property changes */
-webkit-transition: all 0.3s ease-in-out;
-o-transition: all 0.3s ease-in-out;
-ms-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}

a.glidebutton > span:first-child{ /* first span inside button */
position: relative;
display: block;
height: 100%;
padding: 6px; /* padding of button */
-moz-box-sizing: border-box;
box-sizing: border-box;
-moz-transition: all 0.3s ease-in-out; /* Enable CSS transition between property changes */
-webkit-transition: all 0.3s ease-in-out;
-o-transition: all 0.3s ease-in-out;
-ms-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}

a.glidebutton > span:first-child:after{ /* CSS generated content */
content: attr(data-text); /* Duplicate text of span markup */
display: block;
width: 100%;
height: 100%;
-moz-box-sizing: border-box;
box-sizing: border-box;
padding: inherit;
position: absolute;
top:100%;
left:0;
}

a.glidebutton:hover{
color: black; /* color of button on hover */
background: #72cb47; /* bg color of button on hover */
box-shadow: 0 0 4px green inset;
}

a.glidebutton:hover > span:first-child{
-moz-transform: translateY(-100%);
-webkit-transform: translateY(-100%);
-ms-transform: translateY(-100%);
-o-transform: translateY(-100%);
transform: translateY(-100%);
}

/* Menustructuur */

#MenuPlaats li {float:left;
				list-style:none;
				width:135px;
				margin:40px ;
				}

/*Opmaak menu structuur */   
#MenuPlaats li a {display:block;
				  padding: 0px 5px 5px 5px;
				  margin: 0px;
                  color: white;
                  background-color:navy;
                  text-decoration: :underline;
                  margin-top:-0.15cm;}


#MenuPlaats li ul {display: none;} 


/* Uitlijnen van submenu onder menu */
#MenuPlaats li:hover ul, #MenuPlaats li.hover ul {display: block;
   											      position: absolute; 
   											     /*Absolute: Blijft staan, en komt onder volgende menu
   											       Relative: Vergroot menu bovenaan, zodat alles uitgelijnd blijft */
                                                  margin: 0px 0px 0px -4px;}
                                                  
/* Selecteert volledige submenu onderdeel, en niet alleen tekst */
#MenuPlaats li:hover li, #MenuPlaats li.hover li {float: none;
												  display:block;
												  margin: 2px 0px 0px -1px;
												  padding: 1px 0px 1px 5px;
												  }
												  
/* Over het menu worden onderdeel submenu achtergond: blauw en wit, geen onderlijning */
#MenuPlaats li:hover li a, #MenuPlaats li.hover li a {background-color: navy;
													  border-bottom: 1px solid yellow;
                                                      color: white;
                                                      text-decoration: none; }


/* Over het submenu, wordt deze geel */   
#MenuPlaats li li a:hover {background-color:#FFE271; 
						   color:black;									
				           font-weight:900;
				           border-style: outset;}
				      
#MenuPlaats li a:hover{background-color:#5F94DC;}				          
div.clear {clear:both;}

/* Multiple dropdown */


ul ul ul {
			left: 100%;
			top: 0;
			background: #999;
		}
li ul li:hover {display: show ;
		}

</style>

    

</head>
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<div id="MenuPlaats">
    
    <ul>
        <li><center><a class="glidebutton" href="Homepage.html" target="inhoud"> <span data-text="Startpagina">Startpagina</span></a> </center> </li>
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            <center><a class="glidebutton" href="Informatie.html" target="inhoud"><span data-text="Informatie" />Informatie</a> </center>
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        <li> <center> <a class="glidebutton"><span data-text="Foto's"/> Foto's </a></center>
		    <ul>
		        <li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2006?authkey=Gv1sRgCMXIrPP94ZqWtgE" target="_blank"> 2006 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2007?authkey=Gv1sRgCP7kkMr3hs6L0AE" target="_blank"> 2007 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2008?authkey=Gv1sRgCI6d6oDp09OgzQE" target="_blank"> 2008 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2009?authkey=Gv1sRgCODxpZHxp6T-Yg" target="_blank"> 2009 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2010?authkey=Gv1sRgCNuN8qro7u_8_wE" target="_blank"> 2010 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2011?authkey=Gv1sRgCNPsp5rfw6zvbw" target="_blank"> 2011 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2012?authkey=Gv1sRgCMjf7qeDi4XpxgE" target="_blank"> 2012 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2013?authkey=Gv1sRgCJmbruG1xtquPw" target="_blank"> 2013 </a></li>
		    	<li> <a href="https://picasaweb.google.com/103565167018609529959/Survival2014?authkey=Gv1sRgCLv_noPE-4fryAE" target="_blank"> 2014</a></li>
		    	<li> <a href="https://get.google.com/albumarchive/103565167018609529959/album/AF1QipN8eRAMsOIXofqXGoCqAOvX1eHGr7alrCFk-qY7?authKey=CKLJtLTJ4fiVDQ" target="_blank"> 2015 </a></li>
		    	<li> <a href="https://get.google.com/albumarchive/103565167018609529959/album/AF1QipMc0CNnv1bO0JK3wbYZYDFduMDjKhFGAYULXQig?authKey=CNT4osT_ls7_EA" target="_blank"> 2016 </a></li>
                <li> <a href="comingsoon.html" target="inhoud"> 2017 </a></li>
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        <li><center><a class="glidebutton"> <span data-text="Overzicht"/>Overzicht </a></center>
            <ul>
                <li> <a href="Over2006.html" target="inhoud" > 2006 </a> </li>
              	<li> <a href="Over2007.html" target="inhoud" > 2007 </a> </li>
              	<li> <a href="Over2008.html" target="inhoud" > 2008 </a> </li>
              	<li> <a href="Over2009.html" target="inhoud" > 2009 </a> </li>
		        <li> <a href="Over2010.html" target="inhoud" > 2010 </a> </li>
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                <li> <a href="Over2017.html" target="inhoud" > 2017 </a> </li>
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        <li><center><a class="glidebutton" href="history.html" target="inhoud"><span data-text="Geschiedenis"/>Geschiedenis</a></center> </li>
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You want to have submenu under “Overzicht” main menu, correct?
Exactly what problem are you facing? When i check your code, it is looking like already submenu is displayed properly.

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