Complex sentence: It was the 79th running of the Prix de l'Arc de Triomphe and was won by Sinndar, ridden by Johnny Murtagh and trained by John Oxx.
Split into simpler sentences: It was the 79th running of the Prix de l'Arc de Triomphe, and it was won by Sinndar. The winner was ridden by Johnny Murtagh and trained by John Oxx.