Complex sentence: Hearing the two men knock, and expecting a visit from his imam for a Koran lesson, Aamir ran to open the front door, where he was confronted by the two men on the doorstep, wearing balaclavas and holding knives.
Split into simpler sentences: Hearing the two men knock, and expecting a visit from his imam for a Koran lesson, Aamir ran to open the front door. He was confronted by the two men on the doorstep, wearing balaclavas and holding knives.