I'm not sure simplifying the reading is the answer. If they have the vocabulary for the full version, then they won't enjoy the simplified version, and would do better accessing the story through media. If they don't have the vocabulary, than what are the odds they can understand the point of the story? Most of our kids seem to struggle with that, understanding the point and the subtle meanings that make the novel theoretically great, even when they have the reading ability, language, and IQ.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).