Complex sentence: Cedric marries Evangeline the same day, Nanny McPhee (who is now beautiful) magically makes it snow which changes wedding decorations, satisfying Aunt Adelaide's demand, and restores the children's real mother's rattle for them.
Split into simpler sentences: Cedric marries Evangeline the same day, Nanny McPhee magically makes it snow which changes wedding decorations, satisfying Aunt Adelaide's demand. And she also restores the children's real mother's rattle for them.