Complex sentence: The anterior nuclei of thalamus (or anterior nuclear group) are collection of nuclei at the rostral end of the dorsal thalamus which receive efferents from the mammillary bodies and subiculum, and project to the cingulate gyrus.
Split into simpler sentences: The anterior nuclei of thalamus (or anterior nuclear group) are collection of nuclei at the rostral end of the dorsal thalamus. They receive efferents from the mammillary bodies and subiculum, and project to the cingulate gyrus.