Complex sentence: Across the forehead and cheeks and down the side of the neck and left shoulder a clear line separates the light from the dark, a chiaroscuro technique which was used frequently during the Baroque era to add a sense of drama.
Split into simpler sentences: Across the forehead and cheeks and down the side of the neck and left shoulder a clear line may be seen, separating the light from the dark. This chiaroscuro technique was used frequently during the Baroque era to add a sense of drama.