Complex sentence: Perry suffered further following a November 2011 debate in which he was unable to name one of the three government agencies that he would eliminate as president; he later identified the third agency as the Department of Energy.
Split into simpler sentences: Perry suffered further after a November 2011 debate: in the debate, he stated that, as president, he would eliminate three government agencies, but he was then only able to name two of the agencies--he was unable to name the third. He later identified the third agency as the Department of Energy.