Complex sentence: The department has a very rich library with more than 52,000 books which is housed in a three-storey structure within the department having a separate UNO Section, which is the only one available North of New Delhi.
Split into simpler sentences: The department has a very rich library, with more than 52 000 books, which is housed in a three-story structure within the department. It has a separate UNO Section, which is the only one available North of New Delhi.