Complex sentence: Billingsley's long-standing relationship with Ethel Merman brought the theater crowd to the Stork; there she had a waiter assigned to her whose job was just to light her cigarettes.
Split into simpler sentences: Billingsley's long-standing relationship with Ethel Merman brought the theater crowd to the Stork. Merman had a waiter assigned to her whose job was just to light her cigarettes.