Complex sentence: During the collapse of the Qing dynasty Mongols established the Temporary Government of Khalkha on November 30,1911, before the abdication of the last Qing emperor and the establishment of the Republic of China.
Split into simpler sentences: During the collapse of the Qing dynasty in 1911, Mongols established the Temporary Government of Khalkha on November 30,1911. This was before the abdication of the last Qing emperor and the establishment of the Republic of China.