Complex sentence: Under the names Charlotte Armstrong and Jo Valentine she wrote 29 novels, as well as working for the New York Times advertising department, as a fashion reporter for "Breath of the Avenue" (a buyer's guide), and in an accounting firm.
Split into simpler sentences: Under the names Charlotte Armstrong and Jo Valentine she wrote 29 novels. She also worked for "The New York Times" advertising department, as a fashion reporter for "Breath of the Avenue" (a buyer's guide), and in an accounting firm.