Original sentence: He also served on the editorial board of the Journal of African History published by Cambridge University Press, and was a visiting scholar at such insitutions as the Australian National University in 1969, Columbia University in 1970 and the State University of New York in 1990 and 1991
Edited sentence: He also served on the editorial board of the Journal of African History published by Cambridge University Press, and was a visiting scholar at such institutions as the Australian National University in 1969, Columbia University in 1970 and the State University of New York in 1990 and 1991