It is our view that the Assembly has the authority to decline to accept findings of the Tribunal and has also the unquestionable authority to accept the findings of the Tribunal but to vary the awards the Tribunal has made.
Apparently, the tribunal has established "findings" with associated awards. The Assembly reserves the right to accept the findings except as to the amount of the awards, which it will establish.
Here, I've used the word "except" as a synonym of "but". These words mean that what follows them is at odds with what came before: we accept the findings; we do not accept the amount of the awards.