Complex sentence: Ralph W. McGehee (born 1928) is a former agent with the Central Intelligence Agency (CIA) from 1952 to 1977 who went on to be a critic of the agency.
Split into simpler sentences: Ralph W. McGehee (b.1928) is a former agent of the Central Intelligence Agency (CIA). He worked for the CIA from 1952 to 1977 yet went on to be a critic of the agency.