Complex sentence: In March 1945, the base switched to B-29 gunnery training which included the manipulation trainer on the ground with camera guns, and the subsequent population peaked with nearly 11,000 officers and enlisted personnel including more than 4,700 students.
Split into simpler sentences: In March 1945, the base switched to B-29 gunnery training which included the manipulation trainer on the ground with camera guns. The subsequent population peaked with nearly 11,000 officers and enlisted personnel including more than 4,700 students.