Complex sentence: The first expansion, "Goblins vs. Gnomes" (GvG), added 123 cards and the second adventure, "Blackrock Mountain" (BRM), added 31 cards.
Split into simpler sentences: The first expansion, "Goblins vs. Gnomes" (GvG), added 123 cards. The second adventure, "Blackrock Mountain" (BRM), added 31 cards.