Complex sentence: An addition to this building was added in 1967 which consisted of a new academic wing and an additional gymnasium, and in 1976 a new library, a larger cafeteria, modern science laboratories, swimming pool, and more classrooms were added.
Split into simpler sentences: An addition to this building was built in 1967, which consisted of a new academic wing and an additional gymnasium. In 1976 a new library, a larger cafeteria, modern science laboratories, swimming pool, and more classrooms were added.