Complex sentence: The Mongolian horse (Mongolian Морь, "mori" or "mor"' meaning "horse") is the native horse breed of Mongolia and the Mongols, and the breed is purported to be largely unchanged since the time of Genghis Khan.
Split into simpler sentences: The Mongolian horse (Mongolian Морь, "mori" or "mor"': "horse") is the native horse breed of Mongolia. The breed is purported to be largely unchanged since the time of Genghis Khan.