Complex sentence: Maui agrees to help bring the heart back to Te Fiti but in order to do so he needs his hook which is hidden in the realm of monsters, held by a giant villainous coconut crab named Tamatoa.
Split into simpler sentences: Maui agrees to help bring the heart back to Te Fiti. In order to do so, he needs his hook which is hidden in the Realm of Monsters, held by a giant villainous coconut crab named Tamatoa.