Complex sentence: For some months, the group were the first "real" Grass Roots--but the partnership with Sloan and Barri broke up when the band demanded more space for their own more blues rock-oriented material (which Dunhill was not willing to give them).
Split into simpler sentences: For some months, the group were the first "real" Grass Roots. The partnership with Sloan and Barri broke up when the band demanded more space for their own more blues rock-oriented material (which Dunhill was not willing to give them).