Complex sentence: Donna's roommate, Angie said the doll would move on its own sometimes crossing its arms or legs, and supposedly, both girls noticed that sometimes doors which had been left open would close when no one was home.
Split into simpler sentences: Donna's roommate, Angie said the doll would move on its own, sometimes crossing its arms or legs. Both women noticed that doors which had been left open would sometimes close when no one was home.