Complex sentence: Feingold was the only senator to vote against the Patriot Act when it was first introduced in 2001, saying that its provisions infringed upon citizens' civil liberties.
Split into simpler sentences: Feingold was the only senator to vote against the Patriot Act when first voted on in 2001. At the time, Feingold stated that provisions in the act infringed upon citizens' civil liberties.