Complex sentence: Her knowledge of aircraft took her into the WAAF in the Second World War, where she served with the Central Interpretation Unit (CIU) at RAF Medmenham, reaching the rank of Flight Officer.
Split into simpler sentences: Her knowledge of aircraft took her into the WAAF in the Second World War. She served with the Central Interpretation Unit (CIU) at RAF Medmenham, reaching the rank of Flight Officer.