Complex sentence: American patrols north of the feature met no resistance, while the American's were also able to patrol east along Route 17 to Chunchon without contact and by last light the situation had stabilised on the Kapyong Valley front.
Split into simpler sentences: American patrols north of the feature met no resistance, while the American's were also able to patrol east along Route 17 to Chunchon without contact. By last light the situation had stabilised on the Kapyong Valley front.