Complex sentence: Kristol worked as a columnist for "Time" in 2007 and wrote a weekly opinion column for "The New York Times" from January 7,2008 to January 26,2009.
Split into simpler sentences: Kristol worked as a columnist for "Time" in 2007. Kristol wrote a weekly opinion column for "The New York Times" from January 7,2008 to January 26,2009.