Complex sentence: Another of his songs to be covered was "Leave My Kitten Alone" (1959), recorded by the Beatles in 1964 and intended for their "Beatles for Sale" album, but it was not released until 1995.
Split into simpler sentences: Another of his songs to be covered was "Leave My Kitten Alone" (1959). The Beatles recorded a version in 1964, intended for their "Beatles for Sale" album, but it was not released until 1995.