Complex sentence: Finally, Jessie indicates that the only way back to the locker room is to squeeze past her (which he does), giving her a chance to have a final lingering stare at his bare buttocks as he walks away.
Split into simpler sentences: Finally, Jessie indicates that the only way back to the locker room is to squeeze past her. This he does, giving her a chance to have a final lingering stare at his buttocks as he walks away.