Complex sentence: Throughout the' 90s, he played with a number of bands on the East Coast, and when he moved back to Minneapolis in 1997, he started his own band, as he had begun to compose his own music.
Split into simpler sentences: Throughout the' 90s, he played with a number of bands on the East Coast. When he moved back to Minneapolis in 1997, he started his own band, as he had begun to compose his own music.