Complex sentence: Sardarabad was only 40 kilometers west of the city of Yerevan and the battle is currently seen as not only stopping the Ottoman advance into the rest of Armenia but also preventing the complete destruction of the Armenian nation.
Split into simpler sentences: Sardarabad was only 40 kilometers west of the city of Yerevan. The battle is currently seen as not only stopping the Ottoman advance into the rest of Armenia but also preventing the complete destruction of the Armenian nation.