Complex sentence: Harry Driver, who created and wrote many episodes of the series with Vince Powell, died on 25 November 1973 at only 42, just nine months after the series ended, marking the abrupt end of a successful 13-year writing partnership with Powell.
Split into simpler sentences: Harry Driver, who created and wrote many episodes of the series with Vince Powell, died on 25 November 1973, aged only 42. His death occurred just nine months after the series ended, marking the abrupt end of a successful 13-year writing partnership with Powell.