Complex sentence: Dr. I. H. Usmani was a Pakistani Physicist and former Chairman of Pakistan Atomic Energy Commission (PAEC) and former co-chairman of Space and Upper Atmosphere Research Commission (SUPARCO), and Board of Governors of International Atomic Energy Agency (IAEA) from 1962-63.
Split into simpler sentences: Dr. I. H. Usmani was a Pakistani Physicist and former Chairman of Pakistan Atomic Energy Commission (PAEC) and former co-chairman of Space and Upper Atmosphere Research Commission (SUPARCO). Dr. Usamani was also the Board of Governors of International Atomic Energy Agency (IAEA) from 1962-63.