Complex sentence: White is the lightest color and is achromatic (having no hue), because it fully reflects and scatters all the visible wavelengths of light; it is the color of fresh snow, chalk and milk, and is the opposite of black.
Split into simpler sentences: White is the lightest color and is achromatic (having no hue), because it fully reflects and scatters all the visible wavelengths of light. It is the color of fresh snow, chalk and milk, and is the opposite of black.