Complex sentence: Instead they go directly to the market where they purchase medicine and painkillers, even though doing so is potentially dangerous, as North Korea is undergoing a tuberculosis epidemic, because of food problems North Korean's revert to eating grass, tree bark and roots.
Split into simpler sentences: Instead they go directly to the market where they purchase medicine and pain killers. This is extremely dangerous considering that North Korea is undergoing a tuberculosis epidemic, because of food problems North Koreans revert to eating grass, tree bark and roots.