Complex sentence: Nathan B. "Nate" Bruckenthal (July 17,1979April 24,2004) was a United States Coast Guardsman who was killed in the Iraq War, becoming the first to die in wartime action since the Vietnam War.
Split into simpler sentences: Nathan B. "Nate" Bruckenthal (July 17,1979April 24,2004) was a United States Coast Guardsman who was killed in the Iraq War. He was the first U.S. Coast Guardsman to die in wartime action since the Vietnam War.