Complex sentence: A proven bucking horse can be sold for $8000 to $10,000, making "rough stock" an investment worth caring for and keeping in good health for many years.
Split into simpler sentences: A proven bucking horse can be sold for $8000 to $10,000, making "rough stock" a valuable investment that requires proper care. Bucking horses are a valuable investment, worth caring for and keeping in good health for many years.