A practical program of agreements with the Social Democratic workers was proposed by us as far back as September 1930 The Turn in the Comintern and the German Situation that is a year and a quarter ago

Can you repeat this sentence, but add in punctuation?
A practical program of agreements with the Social Democratic workers was proposed by us as far back as September 1930 (The Turn in the Comintern and the German Situation), that is, a year and a quarter ago.