Complex sentence: Landlocked, far from the coast and surrounded by higher altitudes, Botswana is a dry country; the Okavango Delta is indeed an oasis in an arid land, but it would be a mistake to think that the Delta's greenery reflects a tropical climate.
Split into simpler sentences: Landlocked, far from the coast and surrounded by higher altitudes, Botswana is a dry country; the Okavango Delta is indeed an oasis in an arid land. It be a mistake though to think that the Delta's greenery reflects a tropical climate.