Original sentence: Among the most famous of the European explorers was David Livingstone, who charted the vast interior and Serpa Pinto, who crossed both Southern Africa and Central Africa on a difficult expedition, mapping much of the interior of the continent
Edited sentence: Among the greatest of the European explorers was David Livingstone, who charted the vast interior and Serpa Pinto, who crossed both Southern Africa and Central Africa on a difficult expedition, mapping much of the interior of the continent