Complex sentence: When the second half began with Notre Dame trailing 20-12, Montana stayed in the locker room, where Notre Dame medical staff gave him warmed intravenous fluids, covered him in blankets, and most famously, fed him chicken soup.
Split into simpler sentences: When the second half began with Notre Dame trailing 20-12, Montana stayed in the locker room. While in the locker room, Notre Dame medical staff gave him warmed intravenous fluids, covered him in blankets, and most famously, fed him chicken soup.