Complex sentence: It is a cut down simplified version that is still fully compatible with the current v3.5 full Dungeons & Dragons game so characters used in this game can be easily expanded for use in the full game if players so desire.
Split into simpler sentences: It is a cut down, simplified version that is still fully compatible with the current v3.5 full Dungeons & Dragons game. Characters used in this game can be easily expanded for use in the full game, if players so desire.