Complex sentence: In 1965, after Salam fulfilled to established a world-class physics institute in Pakistan, Usmani lobbied in the United States to established the institute which is now called the Pakistan Institute of Nuclear Science and Technology (PINSTECH).
Split into simpler sentences: In 1965, after Salam undertook to establish a world-class physics institute in Pakistan, Usmani lobbied for it in the United States. The institute is now called the Pakistan Institute of Nuclear Science and Technology (PINSTECH).