Complex sentence: During his tenure at the United Nations, Tanin also served in a number of other capacities within the United Nations, including as a Vice-President of the 63rd and 65th Sessions of the General Assembly, and during the 67th session on behalf of the Asian Group.
Split into simpler sentences: During his tenure at the United Nations, Ambassador Tanin has also served in a number of other capacities within the United Nations. Including as a Vice-President of the 63rd and 65th Sessions of the General Assembly and currently during the 67th session on behalf of the Asian Group.