Complex sentence: During World War II, Round became a fighter pilot in the Royal Air Force and was posted to Canada and then the No.1 British Flying Training School in Terrell, Texas, serving as a flying instructor for the United States Air Force.
Split into simpler sentences: During World War II, Round became a fighter pilot in the Royal Air Force and was posted to Canada and then the No.1 British Flying Training School in Terrell, Texas. Later in the war, he served as a flying instructor for the United States Air Force.