One way to do this would be to create the <a> tag itself and then just append the div to it as a child…
// Create an anchor tag
let newAnchor = document.createElement('a');
// Append our div to it as a child
newAnchor.appendChild(document.querySelector('.Australian-Brothers'));
// Append the newAnchor to where in the DOM you want it. Here we are just appending it back to the body of the document.
document.body.appendChild(newAnchor)
Again there is a few different ways to do this. But this example should give you some ideas of which is best for you.
appendChild means “Move this node to be a child of the calling node.”
appendFather would mean “Move this node to be a parent of the calling node.”
“appendFather” = appendChild, but with the parameters reversed.
Though to refine the idea slightly, assuming that the idea isnt to tack a new node on the end, but instead supplant…
let newAnchor = document.createElement('a');
let current = document.querySelector(".Australian-Brothers");
current.insertAdjacentElement('beforebegin',newAnchor).appendChild(current);