Complex sentence: The first and possibly second playings of Hi Lo had different rules--the contestant selected an item, its price was revealed, and they then guessed whether it was one of the three more expensive items or one of the three less expensive items.
Split into simpler sentences: The first and possibly second playings of Hi Lo had different rules. The contestant selected an item, its price was revealed, and they then guessed whether it was one of the three more expensive items or one of the three less expensive items.