I'm looking for a grammar rule here with regards to a non-essential clause that is in the same place as an adjective and acting like a 2nd adjective. In a simple sentence, the 2nd adjective rule is clear:
(1) He was a tired, angry man.
But what to do in a complex sentence, when a 2nd adjective becomes a whole clause. Is it just like the simple sentence and without the comma:
(2)The political background of capitalism is a distinct, although not often explicitly and sharply defined identity among commercial movements in Europe.
Or does it get treated like a non-restrictive clause with a 2nd comma:
(3) The political background of capitalism is a distinct, although not often explicitly and sharply defined, identity among commercial movements in Europe.
I feel like the connection between defined and identity is quite strong, thus making this non-optional, in the same way angry and man is not optional.
(4) He was a tired, angry, man.
To me the above sentence is clearly wrong, so why is a comma not wrong in #3?
Help appreciated.