"In the 2016 novel Desolation by Derek Landy, the premise which follows individuals as they travel a titular "demon road" on which exists all manner of supernatural beings from whom all horror fiction antagonist creators were subconsciously inspired by to create (primarily the villains of the works of Stephen King and 1980s slasher film villains, as well as "real" versions of the Scooby-Doo gang), "IT" is featured as a parody composite character of the "IT" of It Follows and the "IT" of the self-titled novel and its adaptations, depicted as a slow-moving demonic clown who can only be seen by teenagers and children below the age of 18, whom the protagonists Amber and Milo encounter over the course of one of several semi-anthological subplots."

Especially, the part staring from "... all manners of supernatural beings from whom all horror ..." till the end is wrecking my brain. Is it even written correctly? If it is, can someone please break it down into simple sentences so I can go on with my day? 😭

OG text is from the "in popular culture" section of the wiki article for the It Follows film.