Complex sentence: It was the 83rd running of the Prix de l'Arc de Triomphe and was won by Bago, ridden by Thierry Gillet and trained by Jonathan Pease.
Split into simpler sentences: It was the 83rd running of the Prix de l'Arc de Triomphe, and it was won by Bago. The winner was ridden by Thierry Gillet and trained by Jonathan Pease.