Complex sentence: In the 1980s, with a cattle-to-people ratio of three to one--the highest in West Africa--herding provided subsistence for up to 70 percent of the country's people.
Split into simpler sentences: In the 1980s, with a cattle-to-people ratio of three to one, the highest in West Africa. Herding provided subsistence for up to 70 percent of the country's people.