Before revision: They subsequently diverged at c. 18kya into the ancestors of West and West-Central African Niger-Congo and Bantu-speakers, and into the East African Nilo-Saharan/Nilotic-speakers.
After revision: They subsequently diverged at c. 18,000 years ago into the ancestors of West and West-Central African Niger-Congo and Bantu-speakers, and into the East African Nilo-Saharan/Nilotic-speakers.