Complex sentence: The player is given a Free Roll token at the start of the game, with which they can roll a "repeat" number once and continue playing, but the second bad roll ends the game and loses the money.
Split into simpler sentences: The player is given a Free Roll token at the start of the game, with which they can roll a "repeat" number once and continue playing. Once the player has used his or her Free Roll token, he or she may stop at any time; a second bad roll ends the game and loses the money.