Complex sentence: Shortly after the outbreak of war in 1939, he was promoted to the rank of Air Marshal of the Royal Canadian Air Force and he served during the war as Director of the Royal Canadian Air Force and placed in charge of recruitment.
Split into simpler sentences: Shortly after the outbreak of war in 1939, he was promoted to the rank of Air Marshal of the Royal Canadian Air Force. He served during the war as Director of the Royal Canadian Air Force and was placed in charge of recruitment.