We’re having a disagreement about the propriety of a prepositional phrase inside the subject of a sentence, as it’s complicated by the presence of a second prepositional phrase, namely “here.”
Simply–is the following a complete, grammatical, proper English sentence as written?
The level of maturity in argument here is astounding.
Prompted by this specific sentence, but more generally on the propriety of two prepositional phrases back-to-back, is in “…in argument here…,” especially since the first is explaining essence, and being applied to what comes before it (“level of maturity”), while the second directs the reader to a specific place and does not refer back in the same way to what comes before (“here”).
