Complex sentence: It is home to the Caucasus Mountains, which contain Europe's highest mountain, Mount Elbrus,, located on the west end of the Greater Caucasus mountain range which acts as a natural barrier between Europe and Southwest Asia.
Split into simpler sentences: It is home to the Caucasus Mountains, which contain Europe's highest mountain, Mount Elbrus,, located on the west of the Greater Caucasus mountain range. The Greater Caucasus acts as a natural barrier between Europe and Southwest Asia.