Complex sentence: While in Congress, he was chairman of the Committee on Ways and Means (Seventieth and Seventy-first Congresses) and a co-sponsor of the Smoot-Hawley Tariff in 1930.
Split into simpler sentences: While in Congress, he was chairman of the Committee on Ways and Means for the Seventieth and Seventy-first Congresses. Hawley was then a co-sponsor of the Smoot-Hawley Tariff in 1930.