Original sentence: When a Ming messenger came to Goryeo in 1388, the 14th year of U of Goryeo, to demand that Goguryeo’s former northern territory be handed over to Goryeo, General Choe seized the chance to argue for an attack on the Liaodong Peninsula
Edited sentence: When a Ming messenger came to Goryeo in 1388, the 14th year of U of Goryeo, to demand the return of a significant portion of Goryeo’s northern territory, General Choe seized the chance to argue for an attack on the Liaodong Peninsula