Complex sentence: However, the palace was surrounded by the troops of Cheok Chun-gyeong and armed monks led by Yi Cha-gyeom's son, while the rest of the capital remained in the control of the Yi faction.
Split into simpler sentences: However, the palace was surrounded by the troops of Cheok Chun-gyeong and armed monks led by Yi Cha-gyeom's son. The rest of Gaegyeong remained in the control of the Yi faction.