Complex sentence: The mice finish their book, and the Fairy Godmother asks if they are ready to show it to Cinderella, she is spotted out in the hallway and the mice follow after her with the book.
Split into simpler sentences: The mice finish their book, and the Fairy Godmother asks if they are ready to show it to Cinderella. She is spotted out in the hallway and the mice follow after her with the book.