Complex sentence: A similar usage is employed in Terry Pratchett's second Discworld novel, "The Light Fantastic", which describes the opposite of light, but not darkness--rather something that is as far from darkness as normal light, but in the opposite direction.
Split into simpler sentences: A similar usage is employed in Terry Pratchett's second Discworld novel, "The Light Fantastic", describing the opposite of light. Not darkness, but rather as far from darkness as normal light, but in the opposite direction.