A not coherent sentence

Failure of the Second International

While the differences had been evident for decades, World War I proved the issue that finally divided the revolutionary and http://en.wikipedia.org/wiki/Reformism wings of the http://en.wikipedia.org/wiki/Workers%27_movement. The socialist movement had been historically http://en.wikipedia.org/wiki/Antimilitarist and http://en.wikipedia.org/wiki/Proletarian_internationalism, and therefore opposed workers serving as "cannon fodder" for the "bourgeois" governments at war. This especially since the http://en.wikipedia.org/wiki/TripleAlliance(1882) comprised two empires, while the http://en.wikipedia.org/wiki/Triple_Entente gathered France and Britain into an alliance with Russia. Karl Marx's http://en.wikipedia.org/wiki/The_Communist_Manifesto had stated that "the working class has no http://en.wikipedia.org/wiki/Patriotism" and exclaimed "http://en.wikipedia.org/wiki/Workers_of_the_world,_unite!" Massive majorities voted in favor of resolutions for the Second International to call upon the international working class to resist war if it was declared.^{http://en.wikipedia.org/wiki/Communist_International#cite_note-2}

I don't think the underlined sentence is coherent.
And, I think "World War I proved the differences through the true through finally divided~" is more coherent.
How about you?
Thank you in advance for your help.