Complex sentence: Dr. Mirranay worked as a Medical Officer in Afghani refugee camps in Pakistan from 1980--1986 for the United Nations providing humanitarian assistance to Afghan refugees especially in the fields of health care and medical education.
Split into simpler sentences: Dr. Mirranay worked as practicing Medical Officer in Afghani refugee camps in Pakistan from 1980--1986 for the United Nations. His mission was to provide humanitarian assistance to Afghan refugees especially in the fields of health care and medical education.