Complex sentence: There are four concentric zones (or "rounds") of traitors, corresponding, in order of seriousness, to betrayal of family ties, betrayal of community ties, betrayal of guests, and betrayal of liege lords.
Split into simpler sentences: There are four concentric zones (or "rounds") of traitors. These rounds correspond, in order of seriousness, to betrayal of family ties, betrayal of community ties, betrayal of guests, and betrayal of liege lords.