What advances in storytelling were demonstrated in The Great Train Robbery?

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Explanation:

An 11-minute-long escapade telling the story of a gang of bandits who rob a passenger train, The Great Train Robbery is a spectacle- and drama-laden film. It was a breakout success, transcending everything that had been screened before it. Its director was Edwin S. Porter, a camera operator in the Edison Laboratory, who became one of the most successful early American filmmakers. While the earliest Edison films were actualities or brief fictional scenarios, by 1902, technological advancements in motion picture cameras and celluloid made possible longer, more complex narratives like The Great Train Robbery.