Complex sentence: This National Natural Landmark is an extensively eroded channeled scablands landscape, characterized by hundreds of isolated, steep-sided hills (buttes) surrounded by a braided network of numerous channels, all but the channel through which Crab Creek flows are currently dry.
Split into simpler sentences: This National Natural Landmark is an extensively eroded channeled scablands landscape, characterized by hundreds of isolated, steep-sided hills (buttes) surrounded by a braided network of numerous channels. All but the channel through which Crab Creek flows are currently dry.