Complex sentence: The king did not appointed a new ispán while Ernye was being held as a prisoner and after the Battle of Isaszeg in March 1265, the king was forced to accept the authority of Stephen in the eastern parts of the kingdom.
Split into simpler sentences: The king did not appointed a new ispán while Ernye was held in captivity. After the Battle of Isaszeg in March 1265, the king was forced to accept the authority of Stephen at the Eastern parts of the kingdom.