Complex sentence: It was the 87th running of the Prix de l'Arc de Triomphe and was won by Zarkava, ridden by Christophe Soumillon and trained by Alain de Royer-Dupré.
Split into simpler sentences: It was the 87th running of the Prix de l'Arc de Triomphe, and it was won by Zarkava. The winner was ridden by Christophe Soumillon and trained by Alain de Royer-Dupré.