Complex sentence: Greenstone belts are geologic regions generally composed of mafic to ultramafic volcanic sequences that have undergone metamorphism and are associated with sedimentary rocks that occur within Archean and Proterozoic cratons between granitic bodies.
Split into simpler sentences: Greenstone belts are geologic regions generally composed of mafic to ultramafic volcanic sequences that have undergone metamorphism. These belts are associated with sedimentary rocks that occur within Archean and Proterozoic cratons between granitic bodies.