Complex sentence: The Central Library, the Center for Technical Assiatance to Small and Medium-sized Industires, the KAU Aerospace Center/Museum, and the New Administrative Building were built, and the Library and the Student's Hall had a level extension.
Split into simpler sentences: The Central Library, the Center for Technical Assiatance to Small and Medium-sized Industries, the KAU Aerospace Center/Museum, and the New Administrative Building were built. The Library and the Student's Hall had a level extension.