Complex sentence: Billy won two non title fights, including one over Robert Gallois in Paris, and then had a rematch with Napoles in Los Angeles, but this time Napoles returned the favor, knocking Backus out in the fourth round and regaining his title.
Split into simpler sentences: Billy won two non-title fights, including one over Robert Gallois in Paris, and then had a rematch with Napoles in Los Angeles. This time Napoles returned the favor, knocking Backus out in the fourth round and regaining his title.