Complex sentence: Dr. Raymond sneaks up and grabs her from behind as she is on top of the stairs calling out for Norman she screams and plunges the knife into Dr. Raymond as he falls down to the stairs to his death as the knife squishes into him further.
Split into simpler sentences: Dr. Raymond sneaks up and grabs her from behind as she is on top of the stairs calling out for Norman. She screams and plunges the knife into Dr. Raymond as he falls down to the stairs to his death as the knife squishes into him further.