Complex sentence: He was unsuccessful in his attempts to enter the Senate in 1964 and to achieve pre-selection again for Parkes in 1965; his memoirs "Twenty Years'Hard Labor" were published in 1969, revealing Haylen's disillusionment with the ALP.
Split into simpler sentences: He was unsuccessful in his attempts to enter the Senate in 1964 or to achieve pre-selection again for Parkes in 1965. His memoirs "Twenty Years'Hard Labor" were published in 1969, revealing Haylen's disillusionment with the ALP.