I'm writing a review for a fiction book and I'm using a lot of terminology that is specific to the book and I feel that it has to be given some context and explanation. Otherwise any reader would be left in the dark.

I have so far tried this:

Laurent and Phil had to go see the Pope, **the leader of the Catholic Church**, and warn him of a conspiracy to steal his hat.

I just inserted it between commas after the word I wanted to explain was used. Is that the correct way to do it? If it is are there other good techniques you can use to vary your style a bit?