Complex sentence: All other things remaining the same, the longer a player's line, the more the player is risking losing, however, the longer the player's line, the better winning percentage the casino need have in order to break the player's line.
Split into simpler sentences: All other things remaining the same, the longer a player's line, the more the player is risking losing. However, the longer the player's line, the better winning percentage the casino need have in order to break the player's line.