Complex sentence: Also, if the winning team lead by $500--$950 after two rounds, they originally received a prize, but this was later changed to a $500 bonus; winning by $1,000 or more was worth a new car.
Split into simpler sentences: Also, if the winning team lead by $500--$950 after two rounds, they originally received a prize, but this was later changed to a $500 bonus. Winning by $1,000 or more was worth a new car.