Sentence:  The third potential audience is the general public at large, who either never has read any of Tolkien's books or perhaps read "The Lord of the Rings" and/or "The Hobbit" long ago, but whose knowledge about Tolkien's created secondary universe comes, if at all, mostly from seeing Peter Jackson's <WSD>bastardized</WSD> adaptations of "The Lord of the Rings" and/or "The Hobbit". 
Meaning of the word marked with <WSD> tags:  To reduce from a higher to a lower state, such as by removing refined elements or introducing debased elements; to debase.