Complex sentence: In 207 BC, Zhao Tuo defeated King An Dương Vương of the kingdom of Âu Lạc (Viet Nam) and in 206 BC merged it with Guangdong and Guangxi under his command during the time of Qin.
Split into simpler sentences: In 207 BC, Zhao Tuo defeated King An Dương Vương of the kingdom of Âu Lạc (Viet Nam). In 206 BC, he merged the kingdom with Guangdong and Guangxi, which were under his command during the time of Qin.