Complex sentence: Eventually, in 646, the Xueyantuo's Duomi Khan, Bazhuo, was killed by the Huihe and a Tang army led by the general Li Daozong the Prince of Jiangxia crushed Xueyantuo forces.
Split into simpler sentences: Eventually, in 646, the Xueyantuo's Duomi Khan, Bazhuo, was killed by the Huihe. A Tang army led by the general Li Daozong, the Prince of Jiangxia crushed the Xueyantuo forces.