Complex sentence: During the disintegration of China's Jin Dynasty, he expanded Goguryeo's borders into the Liaodong Peninsula and Chinese commanderies, annexing the Lelang commandery in 313 and Daifang commandery in 314.
Split into simpler sentences: During the disintegration of China's Jin Dynasty, he expanded Goguryeo's borders into the Liaodong Peninsula and Chinese commanderies. He annexed the Lelang commandery in 313 and Daifang commandery in 314.