NB - I've amended my reply below - I think I got it wrong when I first posted this.

It depends on the number of ranks assigned to the careers.
 
As It’s +1 for the first rank only for semi-martial careers (assassin, hunter, noble rogue, sailor and torturer), so for your first example of “a character with two semi-martial careers” they get +2 to their combat stats in total (+1 for each).
 
For martial careers (barbarian, gladiator, nomad and soldier) your second example of “2 martial careers at level 1 (and none of them at level 2)” would get the character +2 to their combat stats.
 
Admittedly Garnett’s writing is (untypically) unclear at this point, but the above is my interpretation of the way it works.

Last edited by Gruntfuttock (10/19/2023 6:25 am)

gnombient wrote:

Just picked up the S&S Codex last week...My only complaint is the lack of a hardcover edition...

I believe there are plans afoot to create a hardcover version if the codex continues with its present popularity. Fingers crossed.