Complex sentence: She began her music-business career in 1989 as a receptionist to Clarence Avant where she used her position as a secretary at Motown records to gain invaluable knowledge and the do how's of the music industry.
Split into simpler sentences: She began her music-biz career in 1989 as a receptionist to Clarence Avant. Used her position as a secretary at Motown records to gain invaluable knowledge and the do how's of the music industry.