Original: Following his graduation, he worked for the BBC's classical music department, then joined EMI in 1950, as an assistant to Oscar Preuss, the head of EMI's Parlophone Records from 1950 to 1955. Although having been regarded by EMI as a vital German imprint in the past, it was then seen as a joke and only used for EMI's insignificant acts.
Simplified: He began working for EMI in 1950.