Complex sentence: In the 1950s he served as a studio arranger for RCA and produced over 500 songs for artists such as Paul Anka, Mina and Mireille Mathieu.
Split into simpler sentences: In the 1950s he served as a studio arranger for RCA. During his career he produced over 500 songs for artists such as Paul Anka, Mina and Mireille Mathieu.