Original sentence: Heymann, MD (born 1946 in Pennsylvania, USA) was appointed the Assistant Director-General, Communicable Diseases of the World Health Organization (WHO) in February 2007
Edited sentence: He had been Assistant Director-General, Communicable Diseases of the World Health Organization (WHO) in February 2007.Heymann, MD (born 1946 in Pennsylvania, USA) was appointed Chairman of the Board of the UK Health Protection Agency in April 2009.New Chairman Appointed to Health Protection Agency Board