Complex sentence: The disease then rapidly spread to the neighboring countries of Liberia and Sierra Leone with smaller outbreaks occurring in Senegal, Nigeria, and Mali; the resulting West African Ebola virus epidemic is the largest Ebola outbreak ever documented, and the first recorded in the region.
Split into simpler sentences: The disease then rapidly spread to the neighboring countries of Liberia and Sierra Leone with smaller outbreaks occurring in Senegal, Nigeria, and Mali. The resulting West African Ebola virus epidemic is the largest Ebola outbreak ever documented, and the first recorded in the region.