Complex sentence: Parallels exist in other civilizations, e.g. Mandate of Heaven of the Chinese empire, where for centuries the official decrees by the Emperors of China invariably began with the phrase 奉天承運 皇帝詔曰 which is translated as "By the Grace of Heaven, the Emperor decrees".
Split into simpler sentences: Parallels exist in other civilizations, e.g. Mandate of Heaven of the Chinese empire. Indeed, historically, for quite a few hundred years, all the official decrees by the Emperors of China invariably began with the phrase 奉天承運 皇帝詔曰 which is translated as "By the Grace of Heaven, the Emperor decrees".