Complex sentence: She later replaces the baby Jesus ornament with a Mona doll, opens up the trunk of her car-revealing Mona's body, and makes a snow globe with the picture of The Liars.
Split into simpler sentences: She later replaces the baby Jesus ornament with a Mona doll and opens up the trunk of her car, revealing Mona's body. She then makes a snow globe with the picture of The Liars.