Complex sentence: The symbols inscribed upon the moon are useful in various processes described within the Necronomicon, but it is said transcriptions of these designs can be sensed by the Mi-go, and those possessing them shall be hunted down by the few remaining on earth.
Split into simpler sentences: The symbols inscribed upon the moon are useful in various processes mentioned in the "Necronomicon". It is said that transcriptions of these designs can be sensed by the Mi-go, and those possessing them shall be hunted down by the few remaining on earth.