Complex sentence: During the Qing dynasty (1644--1912), a military unit also called Shenjiying but known in English as the Peking Field Force was created in 1862 and put in charge of military protection of the Forbidden City.
Split into simpler sentences: During the Qing dynasty (1644--1912), there was also a military unit called Shenjiying but was known in English as the Peking Field Force. It was created in 1862 and put in charge of protecting the Forbidden City.