Complex sentence: He was persuaded to accept the role of a non-executive director of the club in April 1973 and held that role until becoming manager of Preston North End from 27 August 1975 to May 1977.
Split into simpler sentences: He was persuaded to accept the role of a non-executive director of the club in April 1973. He had that role until becoming manager of Preston North End from 27 August 1975 to May 1977.