Complex sentence: For some time after the Meiji Restoration, Japan continued to use imported weapons, until it developed its own model, the Murata rifle, derived from the French Fusil Gras mle 1874.
Split into simpler sentences: For some time after the Meiji Restoration, Japan continued to use imported weapons. Japan finally developed its own model, the Murata rifle, derived from the French Fusil Gras mle 1874.