Complex sentence: He was employed by U.S. Office of Economic Opportunity from 1966 to 1967, the U.S. Chamber of Commerce from 1967 to 1968, and was first coordinator of federal-state programs at the State of Mississippi from 1968 to 1972.
Split into simpler sentences: He was employed by U.S. Office of Economic Opportunity from 1966 to 1967. First coordinator of federal-state programs, State of Mississippi from 1968 to 1972.