Complex sentence: It was the 82nd running of the Prix de l'Arc de Triomphe and was won by Dalakhani, ridden by Christophe Soumillon and trained by Alain de Royer-Dupré.
Split into simpler sentences: It was the 82nd running of the Prix de l'Arc de Triomphe, and it was won by Dalakhani. The winner was ridden by Christophe Soumillon and trained by Alain de Royer-Dupré.