Complex sentence: Wolfson paid a supplementary fee of $10,000 to run Roman Brother in the race, as he had not been among the original entries for the race carried prize money of $212,150, making it the most valuable race ever run in New York.
Split into simpler sentences: Wolfson paid a supplementary fee of $10,000 to run Roman Brother in the race, as he had not been among the original entries. The race carried prize money of $212,150, making it the most valuable race ever run in New York.