Complex sentence: It was the 86th running of the Prix de l'Arc de Triomphe and was won by Dylan Thomas, ridden by Kieren Fallon and trained by Aidan O'Brien.
Split into simpler sentences: It was the 86th running of the Prix de l'Arc de Triomphe, and it was won by Dylan Thomas. The winner was ridden by Kieren Fallon and trained by Aidan O'Brien.