Complex sentence: As he is retrieving the beetle from the goat, several arms break through Big Bird's stomach and pull him out, and it is revealed that Pearl and Amethyst have successfully fused into Opal to save Steven.
Split into simpler sentences: As he is retrieving the beetle from the goat, several arms break through Big Bird's stomach and pull him out. It is revealed that Pearl and Amethyst have successfully fused into Opal to save Steven.