Options -MultiViews -Indexes
RewriteEngine On
RewriteRule ^long-life-to-the-united-states/post-name/$ /index.php?p=YourPostIDHere [L]
Where you need to replace YourPostIDHere with the actual post ID.
This will serve the content of that post under long-life-to-the-united-states/post-name/ as well. SEO-wise make sure to put a <meta rel="canonical"> with one of the URLs in the <head> of the HTML to prevent Google marking one as duplicate content of the other.