Complex sentence: The Volstead Act, formally National Prohibition Act, which reinforced the prohibition of alcohol in the United States, was named for Andrew Volstead, Chairman of the House Judiciary Committee, which oversaw its passage.
Split into simpler sentences: The Volstead Act, formally National Prohibition Act, reinforced the prohibition of alcohol in the United States. It was named for Andrew Volstead, Chairman of the House Judiciary Committee, which oversaw its passage.