Complex sentence: MacCorkindale's film debut came in 1974 with "Juggernaut", and his break when he was cast as Simon Doyle in the 1978 film adaptation of Agatha Christie's "Death on the Nile" at the age of 25.
Split into simpler sentences: MacCorkindale's film debut came in 1974 with "Juggernaut". He was cast as Simon Doyle in the 1978 film adaptation of Agatha Christie's "Death on the Nile" at the age of 25.