Complex sentence: The Rokador is a light skinned tribe that wear white clothing and live in underground cities that they tunneled out of the rock with Dygo's, spherical vehicles on tank-like treads with large drill bits protruding from the front.
Split into simpler sentences: The Rokador is a light-skinned tribe that wear white clothing and live in underground cities that they tunneled out of the rock. To excavate further, they use Dygos; spherical vehicles having tank-like treads and large drill bits protruding from the front.