Complex sentence: He attended the San Fernando Valley State College (later re-named California State University, Northridge) for a year, and was a conscientious objector during the Vietnam War, working in alternate service for two years, as a clerk in a Los Angeles hospital.
Split into simpler sentences: He attended the San Fernando Valley State College (later re-named California State University, Northridge) for a year. He was a conscientious objector during the Vietnam War and worked in alternate service for two years as a clerk in a Los Angeles hospital.