Complex sentence: BBC commented that Russia expects only one of two outcomes to take place in the Syrian civil war: either Assad stays in power, ensuring their stronghold influence in the middle east region, or, radical Islamists take over, creating a terror threat for Russia.
Split into simpler sentences: BBC commented that Russia expects only one of two outcomes to take place in the Syrian civil war. Either, Assad stays in power, ensuring their stronghold influence in the middle east region, or, Radical Islamist take over, creating a terror threat for Russia.