<div class="asdasd-1">
<div class="asdasd">
<div class="asdasd">
<div class="asdasd">
blabla
</div>
</div>
</div>
</div>
<div class="dsadsa"></div>
const contentNode = document.querySelector('.asdasd-1');
const output = document.querySelector('.dsadsa');
output.innerHTML = contentNode.innerHTML;