Complex sentence: If a player has three or more black threes in his hand, they may be melded at this time and if the stock is completely depleted when a player is required to draw a card, it is reversed and play continues.
Split into simpler sentences: If a player has three or more black threes in his hand, they may be melded at this time. If the stock is completely depleted when a player is required to draw a card, it is reversed and play continues.