Complex sentence: Bruce somehow kept his young horse on his feet and brought him galloping home to take the lead, but the horse was cooked, and required extensive veterinary treatment with fluids, ice, and oxygen to recover.
Split into simpler sentences: Bruce somehow kept his young horse on his feet and brought him galloping home to take the lead. However, the horse was exhausted beyond measure, and required extensive veterinary treatment with fluids, ice, and oxygen to recover.