Complex sentence: Her first job in the recording industry was in the customer service department of Columbia Records (now known as Sony Classical) where she was secretary and general assistant to Seymour Solomon at Vanguard Records for seven years.
Split into simpler sentences: Her first job in the recording industry was in the customer department of Columbia Records (now known as Sony Classical). She was then the secretary and general assistant of Seymour Solomon at Vanguard Records for seven years.