Complex sentence: On 19 August, 1982, a new five story building was opened, which provided a canteen on the ground floor, a computer lab on the second floor, and a library on the third and fourth floors.
Split into simpler sentences: On 19 August, 1982, a new five-storey building was opened. The new building provided a canteen on the ground floor, a computer lab on the second floor, and a library on the third and fourth floors.