“If any one saith, that, by the Sacrifice of the Mass, a blasphemy is cast upon the most holy sacrifice of Christ consummated on the Cross; or, that it is thereby derogated from; let him be anathema” (The Canons on the Sacrifice of the Mass, canon 4).
What are they saying here? I do not speak this language.
This statement anathematizes those who profess errors about the Mass. As I understand it, there used to be an actual process of anathema. Regardless of whether the anathema is put into effect, the statement of anathema by the council still serves a teaching function (i.e. a negative judgment against certain beliefs/actions).
So the views being described here as deserving anathema are views being condemned by the council.
The condemned propositions are:
That the Sacrifice of the Mass is blasphemous.
That to offer the Eucharist as a Sacrifice is to take away from the Sacrifice of the Cross.
These are views of Protestant reformers that the Council of Trent condemned.