Complex sentence: When Duel died suddenly on December 31,1971 (reportedly of a self-inflicted gunshot), an attempt was made to continue the series with another actor, Roger Davis, in the role of Heyes.
Split into simpler sentences: When Duel died suddenly on December 31,1971 (reportedly of a self-inflicted gunshot). An attempt was made to continue the series with another actor, Roger Davis, in the role of Heyes.