Complex sentence: Wilson decides to hang out with the Shapies as much as he can, which makes the Shapies uncomfortable, so Zack decides to be friends with Wilson; it works, now he won't leave Zack alone.
Split into simpler sentences: Wilson decides to hang out with the Shapies as much as he can, which makes the Shapies uncomfortable. So Zack decides to be friends with Wilson, it works, now he won't leave Zack alone.