Complex sentence: The boys advise their parents to get all the money they have, and then go bet it at the casio--if they win a round of roulette, they would have enough money to buy back the town, plus $50,000.
Split into simpler sentences: The boys advise their parents to get all the money they have, and then go bet it at the casino. If they win a round of roulette, they would have enough money to buy back the town, plus $50,000.