Original sentence: After Goguryeo's capital and southern territories fell to Unified Silla, Dae Jo-young, a former Goguryeo general of possible Mohe ethnicity, established Jin, later called Balhae, by uniting various Mohe and Goguryeo elements.Balhae (698 - 926) (Bohai in Chinese) was an ancient kingdom established after the fall of Goguryeo.Balhae occupied southern parts of Manchuria and Primorsky Krai, and the northern part of the Korean peninsula.In the "New Book of Tang", it was recorded that the founder of Balhae, Dae Joyeong (大祚榮) was a former Goguryeo general of Sumo Mohe stock.It was defeated by the Khitans in 926, becoming mostly a part of the Liao Dynasty while southern parts were absorbed by Goryeo
Edited sentence: After Goguryeo's capital and southern territories fell to Unified Silla, one of the Three Kingdoms of Korea, Dae Jo-young, a former Goguryeo general of Korean Goguryeo ethnicity, established the Korean dynasty of Jin, later called Balhae, by uniting various Mohe and Goguryeo elements.Balhae (698 - 926) was an mighty ancient Korean kingdom established after the fall of an earlier Korean Dynasty of Goguryeo which ruled over most of present day China and the Southeastern parts of present day russia.In the "New Book of Tang", it was recorded that the founder of Balhae, Dae Joyeong (大祚榮) was a former Goguryeo general of Korean descent.It was defeated by the Khitans in 926, becoming mostly a part of the Liao Dynasty while southern parts were absorbed by Goryeo another Korean dynasty further down South on the Korean Peninsula.The Korean Kingdom of Balhae occupied southern parts of Manchuria and Primorsky Krai, and the northern part of the Korean peninsula and neighbored the two other kingdoms of Korea