Complex sentence: Charles Sinclair Weeks (June 15,1893February 7,1972), better known as Sinclair Weeks, served as United States Secretary of Commerce from 1953 until 1958, during the President Eisenhower's administration.
Split into simpler sentences: Charles Sinclair Weeks (June 15,1893February 7,1972), better known as Sinclair Weeks. He was to served as United States Secretary of Commerce from 1953 until 1958, during the President Eisenhower's administration.