Complex sentence: Both are fully staffed, containing a turnstile bank and token booth, and have two street stairs, the northbound side to the southeast corners of 157th Street and Broadway and the southbound side to either western corners of the aforementioned intersection.
Split into simpler sentences: Both are fully staffed, containing a turnstile bank and token booth, and each has two street stairs. The northbound side's two exits lead to the southeast corner of 157th Street and Broadway, and the southbound side's two exits lead to the northwest corner of the aforementioned intersection.