Why was the leftist side divided in the spanish civil war?

After the formation of the Communist International in 1919, there was a growing fear of communism within Spain and growing repression on the part of the government through military means. The PSOE split, with the more left-wing members founding the Communist Party in 1921.

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).