Complex sentence: He was the former lead guitarist for Sheryl Crow from 1993 to 1998, and lead guitarist for Carla Olson from 1991 to 1993.
Split into simpler sentences: He was the lead guitarist for Sheryl Crow from 1993 to 1998. Prior to that, he was the lead guitarist for Carla Olson from 1991 to 1993.