Complex sentence: In 1985, Jackson acquired the ATV Music Publishing catalog (which held the rights to nearly every Beatles song) uncontested by McCartney, and the two "drifted apart" after Jackson didn't give McCartney the "raise" he asked him for.
Split into simpler sentences: In 1985, Jackson acquired the ATV Music Publishing catalog (which held the rights to nearly every Beatles song) uncontested by McCartney. The two then "drifted apart" after Jackson didn't give McCartney the "raise" he asked him for.