Complex sentence: After 1999 he left the band and formed up a new band with his fellow musician that was ROOTS which amazingly won the award of "Best Band" in Benson & Hadges Star search 2003.
Split into simpler sentences: After 1999 he left the band and formed up a new band named'ROOTS' with his fellow musicians. They amazingly won the award of "Best Band" in Benson & Hadges Star search 2003.