Complex sentence: Subsequently, the youngster was subjected to extreme physical and sexual abuse for two and a half years, then killed in a fit of rage by being slammed to the floor after he vomited in the bathtub.
Split into simpler sentences: Subsequently, the boy was subjected to extreme physical and sexual abuse for two and a half years. He was then killed in a fit of rage by being slammed to the floor after vomiting in the bathtub.