Complex sentence: Smart was a British officer in the British Army, the Royal Flying Corps, the Royal Australian Air Force, and the Royal Air Force during First World War, during the interwar period, and during Second World War.
Split into simpler sentences: Smart was a British officer in the British Army, the Royal Flying Corps, the Royal Australian Air Force, and the Royal Air Force. He served during First World War, during the interwar period, and during Second World War.