Original sentence: In 2007, General Electric, Young & Rubicam, Google, Coca Cola, Celtel and Cisco Systems relocated their African headquarters to the city.The United Nations Office at Nairobi hosts UNEP and UN-Habitat headquarters
Edited sentence: In 2007 alone, General Electric, Young & Rubicam, Google, Coca Cola, Celtel and Cisco Systems relocated their Africanheadquarters to the city.The United Nations has strong presence in Nairobi; the United Nations Office at Nairobi hosts UNEP and UN-Habitat headquarters.This makes it one of the most influential cities in Africa