Complex sentence: DePalma had been let go by the Mercer Automobile Co. racing team in favor of the great Barney Oldfield and in a Mercedes "Gray Ghost," DePalma showed he was a master tactician in beating Oldfield's much faster car.
Split into simpler sentences: DePalma had been let go by the Mercer Automobile Co. racing team in favor of Barney Oldfield. In a Mercedes "Gray Ghost," he showed he was a master tactician in beating Oldfield's much faster car.