Complex sentence: He is strapped and taped into his chair and knocks over the wax mask in the process, causing it to smash on the floor, he then scratches his mother's hand, and she slaps the child across the face.
Split into simpler sentences: He is strapped and taped into his chair and knocks over the wax mask in the process, causing it to smash on the floor. He then scratches his mother's hand, and she slaps the child across the face.