Complex sentence: Despite this early success, album sales failed to meet expectations due to the late 1990s merger of Polygram (the parent label of Mercury) with Universal Music Group, resulting in Mercury Records dissolving into Island Def Jam Records.
Split into simpler sentences: Despite this early success, album sales failed to meet expectations. The band was dealt a further blow by the late 1990s merger of Polygram (the parent label of Mercury) with Universal Music Group, resulting in Mercury Records dissolving into Island Def Jam Records.