Complex sentence: Accompanied by the admiring Olive Oyl, the brawny Bluto, and little Swee'Pea, he heads for the Sea of Mystery, which happens to be in the evil Sea Hag's domain.
Split into simpler sentences: Accompanied by the admiring Olive Oyl, the brawny Bluto, and little Swee'Pea. He heads for the Sea of Mystery, which happens to be in the evil Sea Hag's domain.