Complex sentence: As a result of the First Sino-Japanese War in 1894--95, China's control ceased and the Gregorian calendar was adopted by the new Korean Empire on 1 January 1895, but with years numbered from the foundation of the Joseon Dynasty in 1393.
Split into simpler sentences: As a result of the First Sino-Japanese War in 1894--95, Korea's tributary relationship with China ended. The Gregorian calendar was adopted by the new Korean Empire on 1 January 1895, but with years numbered from the foundation of the Joseon Dynasty in 1393.