Complex sentence: Political anarchy and vacuum of power had lasted until 1189 when Temujin became the Khan of the Khamag Mongol and the war broke out between other Mongol tribes soon.
Split into simpler sentences: Political anarchy and vacuum of power had lasted until 1189 when Temujin became the Khan of the Khamag Mongol. The war broke out between the latter and other Mongol tribes soon.