Complex sentence: He later attended the University of Washington, from which he graduated in 1970, and the Iowa Writers' Workshop at the University of Iowa, from which he received an M.F.A. in 1973.
Split into simpler sentences: He later attended the University of Washington, from which he graduated in 1970. He studied at the Iowa Writers' Workshop at the University of Iowa, from which he received an M.F.A. in 1973.