Complex sentence: Shading is the technique of varying the tonal values on the paper to represent the shade of the material as well as the placement of the shadowsd light, shadows, and highlights can result in a very realistic rendition of the image.
Split into simpler sentences: Shading is the technique of varying the tonal values on the paper to represent the shade of the material as well as the placement of the shadows. Careful attention to reflected light, shadows, and highlights can result in a very realistic rendition of the image.