Complex sentence: Clayton Keith Yeutter (born 1930) was U.S. political figureSignificantly, he was U.S. Trade Representative between 1985 and 1989, Secretary of Agriculture from 1989 until 1991; and chairman of Republic National Committee from 1991 and 1992.
Split into simpler sentences: Clayton Keith Yeutter (born 1930) was U.S. political figure. He served U.S. Trade Representative between 1985 and 1989, as Secretary of Agriculture from 1989 until 1991 and chairman of the Republic National Committee from 1991 and 1992.