Complex sentence: Rickles, at age 86, continues to be a frequent guest on late night talk shows, including the Late Show with David Letterman, Jimmy Kimmel Live!, and the The Late Late Show with Craig Ferguson.
Split into simpler sentences: Rickles, at age 86, continues to be a frequent guest on late night talk shows. These include, but are not limited to, the Late Show with David Letterman, Jimmy Kimmel Live!, and the The Late Late Show with Craig Ferguson.