Complex sentence: From North Carolina, he served as a professor at San Francisco State University and in 2000 was affiliated at the University of Arizona when he was recruited as principal at the American Indian Public Charter School in Oakland, California.
Split into simpler sentences: From North Carolina, he served as a professor at San Francisco State University for some time. In 2000 he was affiliated at the University of Arizona when he was recruited as principal at the American Indian Public Charter School in Oakland, California.