Complex sentence: The two set out to find the Blue Fairy, who David remembers from "The Adventures of Pinocchio" and believes can transform him into a human, allowing Monica to love him and take him home.
Split into simpler sentences: The two set out to find the Blue Fairy, who David remembers from "The Adventures of Pinocchio". He is convinced that the Fairy will transform him into a human, allowing Monica to love him and take him home.