Complex sentence: From 1977 until 1990, Pedersen served as the President of the American University of Cairo, and led efforts to have the University receive full higher education accreditation and during his tenure the the size of the university expanded.
Split into simpler sentences: From 1977 until 1990, Pedersen served as the President of the American University of Cairo, and led efforts to have the University receive full higher education accreditation. During his tenure the the size of the university expanded.