Complex sentence: His second daughter, Maureen Edith Pilling, enlisted in the Women's Auxiliary Air Force (WAAF) soon after the outbreak of the Second World War and was eventually promoted to Flight Officer in July 1944.
Split into simpler sentences: His second daughter, Maureen Edith Pilling, enlisted in the Women's Auxiliary Air Force (WAAF) soon after the outbreak of the Second World War. She was eventually promoted to Flight Officer in July 1944.