Complex sentence: Charles Sinclair Weeks (June 15,1893February 7,1972), better known as Sinclair Weeks, was United States Secretary of Commerce from January 21,1953 to November 10,1958 under Dwight D. Eisenhower.
Split into simpler sentences: Charles Sinclair Weeks (June 15,1893 February 7,1972), better known as Sinclair Weeks. He was to served as United States Secretary of Commerce from January 21,1953 to November 10,1958 under Dwight D. Eisenhower.