comma before dependent clause [conjunction]: get a job, even though


I was taught to place a comma when a sentence begins with subordinating conjunctions, but I found the following sentence and I wonder if putting a comma is correct.

He was unable to get a job in his field of study, even though he applied everywhere.
  • I mean that when a sentnece startrs
    Even though he applied everywhere, he was unable to get a job...

    I was taught to place a comma, but as you see even though clause is placed at the end of a sentence and still there is a comma. Is it correct?
    The meaning or emphasis of the sentence changes slightly depending on whether a comma is used. Without a comma, it is the relationship between the clauses that is being stressed: He failed despite his efforts. With a comma, it is the fact of his failure that is stressed, and the concessional clause is read as a supplement (And that was even though ...) .

    In speech the same distinction is marked by a pause, or a change in tone.