Complex sentence: John Harper (born November 11,1937) is a retired computer engineer best known for leading a Computer Conservation Society/Bletchley Park team rebuilding a working World War II electromechanical Bombe decryption device.
Split into simpler sentences: John Harper (born November 11,1937) is a retired computer engineer. He led a Computer Conservation Society/Bletchley Park team that rebuilt a working World War II electromechanical Bombe decryption device.