Complex sentence: Coraline searches through the Other World and overcomes the Other Mother's obstacles by using her wits and Miss Spink's lucky stone to find the marble-like souls of the ghost children and deduces that her parents are imprisoned in a snow globe on the mantelpiece.
Split into simpler sentences: Coraline searches through the Other World and overcomes the Other Mother's obstacles by using her wits and Miss Spink's lucky stone to find the marble-like souls of the ghost children. She also deduces that her parents are imprisoned in a snow globe on the mantelpiece.