Complex sentence: It was the 72nd running of the Prix de l'Arc de Triomphe and was won by Urban Sea, ridden by Eric Saint-Martin and trained by Jean Lesbordes.
Split into simpler sentences: It was the 72nd running of the Prix de l'Arc de Triomphe, and it was won by Urban Sea. The winner was ridden by Eric Saint-Martin and trained by Jean Lesbordes.