Complex sentence: Alben W. Barkley, who graduated from Emory in 1900, represented Kentucky in the United States House of Representatives and in the Senate before becoming--at age 71 in 1949--the oldest Vice-President of the United States in history.
Split into simpler sentences: Alben W. Barkley, who graduated in 1900, represented Kentucky in the United States House of Representatives and in the Senate. In 1949, at age 71, he became the oldest Vice-President of the United States in history.