Original: In the 16th and 17th centuries , Mongolia came under the influence of Tibetan Buddhism . At the end of the 17th century , most of Mongolia had been incorporated into the area ruled by the Qing Dynasty .
Simplified: After the 16th century , Mongolia came under the influence of Tibetan Buddhism and by the end of the 17th century , most of Mongolia had been incorporated into the area ruled by the Qing Dynasty .