Complex sentence: It was the 69th running of the Prix de l'Arc de Triomphe and was won by Saumarez, ridden by Gérald Mossé and trained by Nicolas Clément.
Split into simpler sentences: It was the 69th running of the Prix de l'Arc de Triomphe, and it was won by Saumarez. The winner was ridden by Gérald Mossé and trained by Nicolas Clément.