Complex sentence: As they die, the culprit crosses out their yearbook photos, a device used in subsequent slasher films such as "Prom Night" (1980) and "Graduation Day" (1981).
Split into simpler sentences: As they die, the culprit crosses out their yearbook photos. This device would later be used in subsequent slasher films such as "Prom Night" (1980) and "Graduation Day" (1981).