Complex sentence: They reveal that when they failed to find Dory in Quarantine, they deduced she escaped into the ocean; hoping that she would one day discover them, they spent years forming trails of shells for her to follow.
Split into simpler sentences: They reveal that when they failed to find Dory in Quarantine, they deduced she escaped into the ocean. Hoping that she would one day discover them, they spent years forming trails of shells for her to follow.