Complex sentence: In 1974 he became Director of Marketing for CBS, succeeding Clive Selwood, and achieved the distinction of seeing 14 of the company's singles in the Top 50 and 7 of CBS's albums in the Top 20 in the same week.
Split into simpler sentences: In 1974 he became Director of Marketing for CBS, succeeding Clive Selwood. During his time there 14 of the company's singles were in the Top 50 and 7 of CBS's albums in the Top 20 in the same week.