Complex sentence: In January 1913, Dorzhiev arranged a treaty between Tibet and Mongolia that was signed in Urga by Dorzhiev and two Tibetans on behalf of the Dalai Lama and by two Mongolians for the Jebtsundamba Khutukhtu.
Split into simpler sentences: In January 1913, Dorzhiev arranged a treaty between Tibet and Mongolia. It was signed in Urga by Dorzhiev and two Tibetans on behalf of the Dalai Lama, and by two Mongolians for the Jebtsundamba Khutukhtu.