Complex sentence: The subparietal sulcus ("Sulcus subparietalis") or suprasplenial sulcus is a sulcus, or crevice, on the medial surface of each cerebral hemisphere, above the splenium of the corpus callosum, separating the precuneus from the posterior part of the cingulate gyrus.
Split into simpler sentences: The subparietal sulcus ("Sulcus subparietalis") or suprasplenial sulcus is a sulcus, or crevice, on the medial surface of each cerebral hemisphere, above the splenium of the corpus callosum. It separates the precuneus from the posterior part of the cingulate gyrus.