Complex sentence: He also ended up unexpectedly winning the inaugural race at Montreal in August: the NAPA Auto Parts 200 after with 2 laps to go, leader Robby Gordon was black-flagged for intentionally causing an accident which involved rookie Marcos Ambrose.
Split into simpler sentences: He also ended up unexpectedly winning the inaugural race at Montreal in August, the NAPA Auto Parts 200, after with two laps to go. Leader Robby Gordon was black-flagged for intentionally causing an crash involving rookie Marcos Ambrose.