Complex sentence: The terms of the wager state that if the lawyer can live in solitary confinement for 15 years, he will be given 2 millionker's fortune declines and he realizes that he will be unable to pay off the bet.
Split into simpler sentences: The terms of the wager state that if the lawyer can live in solitary confinement for 15 years, he will be given 2 million. In the meantime, the banker's fortune declines and he realizes that he will be unable to pay off the bet.