Complex sentence: Dong was born in modern Hengshui, Hebei in 179 BC, he entered the imperial service during the reign of the Emperor Jing of Han and rose to high office under the Emperor Wu of Han.
Split into simpler sentences: Dong was born in modern Hengshui, Hebei in 179 BCE. He entered the imperial service during the reign of Emperor Jing of Han and rose to high office under Emperor Wu of Han.