Earlier quoted context omitted.
> Oh, and use an editor (the human kind, not the digital kind.) This is so important (IMNSHO). It's fairly obvious, that editors are becoming a "lost art." My mother was a scientific editor, and she was brutal (she edited some of my work). It's really hard to find fiction books, that are less than 500 pages. I read a story about Stephen King. Apparently, he hates being edited (most writers don't like it). When he was…
> It's really hard to find fiction books, that are less than 500 pages. To play editor for a moment — your sentence needs no comma, and it’s easy to find fiction books with fewer than 500 pages ;) Was a clause omitted?
The suggestion is to never separate a subject from a verb or a verb from its object