Complex sentence: Session musicians and songwriters played a role as before, and both Huizenga and Martin returned to make a few contributions, but overall the playing, collaboration, and production were dominated by Tawgs Salter and Jeff "Diesel" Dalziel.
Split into simpler sentences: Session musicians and songwriters played a role as before, and both Huizenga and Martin returned to make a few contributions. However, the playing, collaboration, and production were dominated by Tawgs Salter and Jeff "Diesel" Dalziel.