Complex sentence: He served most of one term from March 4,1917 to July 2,1921, where he was Chairman of the Committee on Expenditures in the Department of Commerce in the 65th Congress.
Split into simpler sentences: He served most of one term from March 4 1917 to July 2 1921. During this time, he was Chairman of the Committee on Expenditures in the Department of Commerce in the 65th Congress.