Complex sentence: One night, as Carter is inside Leah's house, her neighbor, Mrs. McCarthy (Tess Harper) catches him, leading him to chase her back to her house where he kills her by pushing her down the stairs, causing her to break her neck.
Split into simpler sentences: One night, Carter is discovered inside Leah's house by her neighbor, Mrs. McCarthy (Tess Harper). Carter chases Mrs. McCarty and kills her by pushing her down the stairs, causing her to break her neck.