Original sentence: Armenia: The Armenians, who constituted the third largest ethnic group in Eastern Anatolia before the Armenian Genocide, were given a large part of the region; including provinces which didn't have significant Armenian populations such as the Black Sea port city of Trabzon
Edited sentence: Armenia: The Armenians, who had constituted only the third largest ethnic group in Eastern Anatolia after the Turks and Kurds, were given a large part of the region; including provinces which didn't have significant Armenian populations such as the Black Sea port city of Trabzon