Complex sentence: Prior to the Jackpot's introduction a bonus prize, usually around $500 in value, was given to any contestant who spun a natural triple, and these prizes were kept regardless of the game's outcome.
Split into simpler sentences: Prior to the Jackpot's introduction a bonus prize, usually around $500 in value, was given to any contestant who spun a natural triple. Natural Triple prizes were kept regardless of the game's outcome.