Complex sentence: In 1959 work was finished on a 9 story addition to the northeastern side of the building along Hawk and Elk streets, the addition is officially called the New York State Department of Education Building Annex.
Split into simpler sentences: In 1959 work was finished on a nine story addition to the northeastern side of the building along Hawk and Elk streets. The addition is officially called the New York State Department of Education Building Annex.