All was not going well in other ways too for in 1885 MittagLeffler persuaded Cantor to withdraw one of his papers from Acta Mathematica when it had reached the proof stage because he thought it about one hundred years too soon

Could you correct the punctuation please?
All was not going well in other ways too, for in 1885 Mittag-Leffler persuaded Cantor to withdraw one of his papers from Acta Mathematica when it had reached the proof stage because he thought it "... about one hundred years too soon".