Complex sentence: At the time of the UFC's inception in 1993, the sport of mixed martial arts was unsanctioned in the United States, and did not include weight classes; instead of the traditional championship model, the UFC held tournaments with the winner receiving a permanent appellation.
Split into simpler sentences: At the time of the UFC's inception in 1993, the sport of mixed martial arts was unsanctioned in the United States, and did not include weight classes. Instead of the traditional championship model, the UFC held tournaments with the winner receiving a permanent appellation.