Complex sentence: In 2004, he was killed in Baqubah, Iraq, by an explosion when he had ordered his unit to take cover as he stepped forward to engage a suspicious vehicle, which was later found to be carrying more than 200 pounds of explosives.
Split into simpler sentences: In 2004, he was killed in Baqubah, Iraq, in an explosion. He had ordered his unit to take cover as he stepped forward to engage a suspicious vehicle, which was later found to be carrying more than 200 pounds of explosives.