Complex sentence: The rest is history (see Evergreen, Winter 2008), with Casey writing the jokes for Listen with Les for 12 years, in fact when he first saw the scripts Dawson remarked they were more like him than he was himself !
Split into simpler sentences: The rest is history, with Casey writing the jokes for "Listen with Les" for 12 years. When he first saw the scripts Dawson remarked they were more like him than he was himself!