Complex sentence: In March 1961 Decca sacked Green and brought in their own editor, Jimmy Watson, a former Decca group press officer, who changed the title to New Record Mirror and considerably streamlined the paper, ditching the show-business element.
Split into simpler sentences: In March 1961 Decca in their own editor, Jimmy Watson, a former Decca group press officer. Watson changed the title to New Record Mirror, considerably streamlining the paper and ditching the show business element.