Complex sentence: From 1970 to 1975 Kieffer worked in the Department of State and the Department of Transportation, and in 1978 became the Director of the National Committee on Careers for Older Americans.
Split into simpler sentences: From 1970 to 1975 Kieffer worked in the Department of State and the Department of Transportation. In 1978 he became the Director of the National Committee on Careers for Older Americans.