On April 14 he informed the Chiefs of Staff that he would stop seventy miles short of Berlin on the Elbe line adding If you agree I propose to inform Marshal Stalin as British objections had already been overridden the first three words were but a matter of form

Can you repeat this sentence, but add in punctuation?
On April 14 he informed the Chiefs of Staff that he would stop seventy miles short of Berlin, on the Elbe line, adding "If you agree, I propose to inform Marshal Stalin"; as British objections had already been overridden, the first three words were but a matter of form.