Complex sentence: The lateral geniculate nucleus (LGN) of the thalamus is a part of the brain, which is the primary processor of visual information, received from the retina, in the central nervous system.
Split into simpler sentences: The lateral geniculate nucleus (LGN) is the primary processing center for visual information received from the retina of the eye. The LGN is found in the thalamus of the brain, and is thus part of the central nervous system.