Complex sentence: Raghib Ismail returned a punt 92 yards for a touchdown with 43 seconds left that would've sealed a victory for Notre Dame, and cost Colorado a share of the National Championship.
Split into simpler sentences: Raghib Ismail returned a punt 92 yards for the seeming winning touchdown with 43 seconds left. This would have sealed the victory for Notre Dame and cost Colorado a share of the National Championship.