Complex sentence: While the royal ball begins, several of Shrek's friends band together to free the trio, creating a monster-sized gingerbread man, which breaks through the castle's defences so Shrek can prevent Charming from kissing Fiona.
Split into simpler sentences: While the royal ball begins, several of Shrek's friends band together to free the trio. Afterwards, the gang creates a monster-sized gingerbread man, which breaks through the castle's defences so Shrek can prevent Charming from kissing Fiona.