Complex sentence: During the Roosevelt and Truman presidencies Hansen was influential in shaping policy, as a member of numerous government commissions and as consultant to the Federal Reserve Board, the United States Department of the Treasury and the National Resources Planning Board.
Split into simpler sentences: During the Roosevelt and Truman presidencies Hansen was influential in shaping policy. He served on government commissions and as consultant to the Federal Reserve Board, the United States Department of the Treasury and the National Resources Planning Board.