Complex sentence: He was commissioned in the Royal Warwickshire Regiment in 1914, during the First World War and fought on the Western Front and in the Second World War was commander of the 1st Airlanding Brigade of the 1st Airborne Division.
Split into simpler sentences: He was commissioned in the Royal Warwickshire Regiment in 1914, during the First World War, and fought on the Western Front. In the Second World War he was commander of the 1st Airlanding Brigade of the 1st Airborne Division.