Complex sentence: It began with a 2-year-old boy in a village in the Guéckédou Prefecture, and subsequently spread through Guinea and four other West African countries, including Senegal, Nigeria, Sierra Leone, and Liberia.
Split into simpler sentences: It began with a 2-year-old boy in a village in the Guéckédou Prefecture. It subsequently spread through Guinea and four other West African countries, including Senegal, Nigeria, Sierra Leone, and Liberia.