Comment by cvoss
If you're confused by the glaring bracket-matching errors in the opening quotation, it is missing two left brackets at the start of the sentence and three right brackets at the end of the sentence. That would correctly balance and nest the bracket pairs and bring the total number of clauses to 8, as described in the first paragraph.
I wonder if the missing brackets are an artifact of some weird automated typesetting/rendering or if an editor who never bothered to read the article came through and said, "Quotations shouldn't start and end with random brackets!"
I didn't catch the missing brackets, but I did stop reading after the Sumerian quote that bracketed each nested clause independently.