It was nearly dark. A snowmobile appeared. The snowmobile was roaring. It was running without lights. It hit Mrs. Li. （ long sentence ）
It was nearly dark when a roaring snowmobile appeared, running without lights, and hit Mrs. Li.
It was nearly dark. A snowmobile appeared. The snowmobile was roaring. It was running without lights. It hit Mrs. Li. （ long sentence ）
It was nearly dark when a roaring snowmobile appeared, running without lights, and hit Mrs. Li.
