Complex sentence: His father, "King Yuri", afraid from this prophecy, and also couldn't kill his own son, ordered his elder son, "Haemyung", to take baby Muhyul with him outside the palace to live as a commoner.
Split into simpler sentences: His father, "King Yuri", feared that this prophecy would come to pass, but couldn't bring himself to kill his own son. He ordered his elder son, "Haemyung", to take baby Muhyul with him outside the palace to live as a commoner.