Complex sentence: Over the almost 100 years it has been around, there is one four-minute clip of consecutive scenes from it, though it was filmed on 6 reels stretching totaling 6,000 feet of film.
Split into simpler sentences: Over the almost 100 years it has been around, there is just one four-minute clip of consecutive scenes from the film. It was filmed on 6 reels stretching to 6,000 feet of film.