Complex sentence: Gingrich has taken a diminutive view of internationalism and the United Nations, saying in 2015, after several years of looking at the UN, I can report to you that it is sufficiently corrupt and sufficiently inefficient.
Split into simpler sentences: Gingrich has taken a diminutive view of internationalism and the United Nations. He said in 2015, after several years of looking at the UN, I can report to you that it is sufficiently corrupt and sufficiently inefficient.