Complex sentence: He became the Permanent Representative (ambassador) of Guyana to the United Nations on February 18 1987, and he served as the President of the Forty-Eighth Session of the United Nations General Assembly, which was held from 1993 to 1994.
Split into simpler sentences: He became the Permanent Representative (ambassador) of Guyana to the United Nations on February 18 1987. He was the President of the Forty-Eighth Session of the United Nations General Assembly, which was held from 1993 to 1994.