Complex sentence: The film marked the first appearance of Graham Moffatt in a Will Hay film, Moffatt would go on to act as a straight man to Hay along with Moore Marriott, beginning in the following film, Windbag the Sailor.
Split into simpler sentences: The film marked the first appearance of Graham Moffatt in a Will Hay film. Moffatt acted as a straight man to Hay, along with Moore Marriott, beginning in the film Windbag the Sailor.