"Simple English" corpus that's larger than simple.wikipedia.org

Does anyone have any leads on a large-ish 'simple English' dataset; anything north of a few GB is great. The [`simple.wikipedia.org`](https://simple.wikipedia.org/wiki/Main_Page) corpus is too small for my current needs, plus given the crowd-sourced nature of Wikipedia articles, edits, etc. I'm not confident that the articles on that Wikipedia are indeed written in a consistent 'simple English' style. (I don't yet have any qualitative evidence of this; it's purely observational from years of exploring `simple.wikipedia.org` along side 'regular Wikipedia', but some …

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