Complex sentence: Within moments, Peter and Lois turn their abusive criticisms on each other, ending with Peter running away to his room crying, and leaving Meg and Brian (minus a knocked-out Chris) to discuss what just happened.
Split into simpler sentences: Within moments, Peter and Lois turn their abusive criticisms on each other. Peter then runs away to his room crying, leaving Meg and Brian (minus a sleeping Chris) to discuss what just happened.