Complex sentence: Salmoni appeared as a guest on "The Late Show with David Letterman" on September 2,2003, on "The Tonight Show with Jay Leno" on November 1,2007, and on "Chelsea Lately" on August 20,2009.
Split into simpler sentences: Salmoni appeared as a guest on "The Late Show with David Letterman" on September 2,2003 and was a guest on "The Tonight Show with Jay Leno" on November 1,2007. He was also a guest on "Chelsea Lately" on August 20,2009.