Complex sentence: The Dielectric shader is used for materials such as liquid or glass with a high index of refraction, and models the behavior of rays passing between materials with differing refractive indices, as well as attenuation of the ray as it passes through a material.
Split into simpler sentences: The Dielectric shader is used for materials such as liquid or glass with a high index of refraction. The shader models the behavior of rays passing between materials with differing refractive indices, as well as attenuation of the ray as it passes through a material.