Complex sentence: Within three years Marchetti became disillusioned with the policies and practices of the CIA, and resigned in 1969, writing an exposé of the CIA in a book published in 1971 entitled "The Rope Dancer".
Split into simpler sentences: Within three years Marchetti became disillusioned with the policies and practices of the CIA. Afterwards, Marchetti wrote an exposé of the CIA in a book published in 1971 entitled "The Rope Dancer".