Complex sentence: Uranium mining in Namibia is notable as the country has the world's largest uranium mine; in 1999, the International Atomic Energy Agency reported that the only operating mine in the county was the Rossing.
Split into simpler sentences: Uranium mining in Namibia is notable as the country has the world's largest uranium mine. In 1999, the International Atomic Energy Agency reported that the only operating mine in the county was the Rossing.