Complex sentence: Massoud, a naturalized citizen, reports this to the police and identifies Lester from a photo, resulting in a reprimand by Internal Affairs, and furiously warns Kathy to back off.
Split into simpler sentences: Massoud, a naturalized citizen, reports this to the police and identifies Lester from a photo. Lester is reprimanded by the police department's Internal Affairs and furiously warns Kathy to back off.