Complex sentence: It was named the Gilf Kebir (Great Barrier) by the first European to sight it, this 7770-square-kilometre limestone and sandstone plateau roughly the size of Switzerland rises 300m from the desert floor.
Split into simpler sentences: It was named the Gilf Kebir (Great Barrier) by the first European to sight it. This 7770-square-kilometre limestone and sandstone plateau roughly the size of Switzerland rises 300m from the desert floor.