Rearranging div elements in functions.php file

I’m using the Smpl Skeleton theme at the moment, and I’m trying to understand how to move the div elements in the functions.php page.

I want to move my #sidebar element inside the wrap container e.g.:

<div id=”wrap” class=”container”>
<div class=”sidebar” class=”ten columns” role=”complementary
<!–content goes here–>
</div>
</div>
<div id=”footer” columns=”sixteen columns”>
<!–content goes here–>
</div>

Thanks.