Complex sentence: Another member, Stoan began his musical career as a singer for the kwaito band Thebe, while Thandwisa (or Red as she if often called), joined in 1997 after working with them as a backup singer and studio musician.
Split into simpler sentences: Another member, Stoan began his musical career as a singer for the kwaito band Thebe. While Thandwisa or Red as she if often called, joined in 1997 after working with them as a backup singer and studio musician.