Complex sentence: He has been the Honorary President of International Pediatric Association (IPA) since 1992 and was the president of IPA between 1968 and 1977, and the Executive Director between 1977 and 1993.
Split into simpler sentences: He has been the Honorary President of International Pediatric Association (IPA) since 1992. He was the president of IPA between 1968 and 1977, Executive Director between 1977 and 1993.