Complex sentence: The two couples, now ready for the game, would have to answer multiple choice general knowledge questions, if a couple got a question wrong, their car would move up a level on a moving platform and closer to the crusher.
Split into simpler sentences: The two couples, now ready for the game, would have to answer multiple choice general knowledge questions. If a couple got a question wrong, their car would move up a level on a moving platform and closer to the crusher.