You can take "in fact" out of the sentence to help with determine what type of sentence it is because it's a prepositional phrase. This leaves us with "Only a small percentage of Southern Africa is desert" which is a simple sentence.
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In the year 1651 Robinson Crusoe boarded a ship for London. ... The ship was hit by a storm and the men on board had to be rescued by a nearby ship.
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Thoreau was jailed for refusing to pay a poll tax on the grounds that the money might be used to pay for the Mexican–American War, which he opposed.
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