The man, from the country, is just one of my close friends.
The man from the country is just one of my close friends.
I'm curious to know whether there are any subtle differences in meaning or in use. I suspect number 2 could be used when I want to clarify who's the man I'm referring to among the men we've already known or talked about, but if it wouldn't be confusing who's the man I'm indicating, then, I think I don't need to add commas. I mean if there was the only man who we have just talked about, there's no need to restrict the information of the man by adding "from the country" without commas, but I'm not sure whether my understanding is getting to the point, and could you please bring out or make up some sentences in which preposition phrases starting with "of" can be used as examples for teaching this topic?