I’m not sure who it was that made run-on sentences in book descriptions a thing.
I know many authors devoted to their craft who avoid long sentences with multiple commas like the plague.
I know that inside the book, editors hunt these things down.
And yet in a book blurb, they often rear their ugly head.
I am also strongly opposed to filling a sentence with so many plot points that the reader can’t help but think the book is purely plot.
So you really want to consider the flow of your book description when you’re writing it.
That means there can be some long sentences, but they should be buttressed by short sentences.
Make it sound more interesting.
Emphasize certain words or concepts or phrases.
You need it not to be a sing-song, phrases that lull you to sleep, every sentence is the same length, every sentence is the exact same structure, all the words carry the same rhythm.
If you do that (like I did with those clauses in the line above!), you’ll push readers away.
Your blurb is key to converting browsers to buyers.
You need to make sure that every sentence is doing its job.
And make every sentence simple enough to pull your readers in deep.