Complex sentence: Photosensitive ganglion cells innervate various other brain targets, such as the midbrain pupillary control center, and apparently contribute to a host of behavioral responses to ambient lighting conditions.
Split into simpler sentences: Photosensitive ganglion cells also innervate various other brain targets, such as the midbrain pupillary control center. They contribute to regulate pupil size and other behavioral responses to ambient lighting conditions.