Complex sentence: Lennon was being sued by Morris Levy over copyright infringement of one line in his song "Come Together", as part of an agreement, Lennon had to include three Levy-owned songs on "Rock'n' Roll".
Split into simpler sentences: Lennon was being sued by Morris Levy over copyright infringement of one line in his song "Come Together". As part of an agreement, Lennon had to include three Levy-owned songs on "Rock'n' Roll".