We have done so because it is important in determining the international role which MittagLeffler went on to play for his passion for international cooperation in mathematics was a direct consequence of what he saw on his three year trip abroad

Can you repeat this sentence, but add in punctuation?
We have done so because it is important in determining the international role which Mittag-Leffler went on to play, for his passion for international cooperation in mathematics was a direct consequence of what he saw on his three year trip abroad.