Complex sentence: The film was originally going to be produced by John Coates, who was notable for producing The Snowman; but when Coates passed away in 2012, Camilla Freakin and Ruth Fielding were then hired to help complete the film.
Split into simpler sentences: The film was originally going to be produced by John Coates, who was notable for producing The Snowman. When Coates passed away in 2012, Camilla Freakin and Ruth Fielding were then hired to help complete the film.