Complex sentence: From 1875 to 1877, the Balkan crisis intensified with rebellions against Ottoman rule by various Slavic nationalities, which the Ottoman Turks dominated since 16th century; this was seen as a political risk in Russia, which similarly suppressed Muslims in Central Asia and Caucasia.
Split into simpler sentences: From 1875 to 1877, the Balkan crisis intensified with rebellions against the Ottoman rule by various Slavic nationalities, which the Ottoman Turks dominated since the 16th century. This was seen as a political risk in Russia, which similarly suppressed Muslims in Central Asia and Caucasia.