Complex sentence: D'Amour returns to Quaid's Fortune Teller shop, where he finds an address book with the name "Jennifer Desiderio", who was missing, and now lives in a mental asylum.
Split into simpler sentences: D'Amour returns to Quaid's Fortune Teller shop, where he finds an address book with the name "Jennifer Desiderio". She was missing and now lives in a mental asylum.