Complex sentence: Besides the capital, Kinshasa, the country's other largest cities are both mining communities (Lubumbashi and Mbuji-Mayi) and the country's largest exports are raw minerals with China accepting over 50% of DRC's exports in 2012.
Split into simpler sentences: Besides the capital, Kinshasa, other largest cities are both mining communities (Lubumbashi and Mbuji-Mayi). DR Congo's largest export is raw minerals, with China accepting over 50% of DRC's exports in 2012.