Complex sentence: An infant who acts in an adult way, Stewie is initially obsessed with violence and matricide, Stewie (voiced by Seth MacFarlane) is the youngest child of Peter and Lois Griffin, and the brother of Meg and Chris Griffin.
Split into simpler sentences: An infant who acts in an adult way, Stewie (voiced by Seth MacFarlane) is initially obsessed with violence and matricide. He is the youngest child of Peter and Lois Griffin, and the brother of Meg and Chris Griffin.