Complex sentence: Earlier recordings consisted of cover songs and originals in a more assaultive abstract or dense and sludgy experimental sound, which style evolved into a more poppy style which enabled them frequent college radio airplay until personality clashes destroyed the band.
Split into simpler sentences: Earlier recordings consisted of cover songs and originals in a more assaultive abstract or dense and sludgy experimental style. After a transitional peroid that sound evolved into a more pop music which enabled them frequent college radio airplay until personality clashes destroyed the band.