Complex sentence: In 2005, he became an aide for the U.S. Senate Committee on Commerce, Science and Transportation, serving U.S. Senator David Vitter, and served as staff director for the U.S. Senate Subcommittee on Climate Change and Impacts.
Split into simpler sentences: In 2005, he became an aide for the U.S. Senate Committee on Commerce, Science and Transportation, serving U.S. Senator David Vitter. He was also the staff director for the U.S. Senate Subcommittee on Climate Change and Impacts.