1、The exam was postponed the class was canceled as well.(simple sentence)
The exam was postponed. The class was canceled as well.
2、You send more time studying. You are going to get better grades.(complex sentence)
If you send more time studying, you are going to get better grades.
3、Mary is bright. She is beautiful. She is considerate.(parallel structure)
Mary is bright, beautiful and considerate.
4、It was nearly dark. A snowmobile appeared. The snowmobile was roaring. It was running without lights it hit Mrs. Clifford.(long sentence)
It was nearly dark, and a roaring snowmobile hit Mrs. Clifford because it was running without lights.
5、Helen pulled the lid of the manhole(下水道). She did it with all of her strength(simple sentence with prepositional phrase at the beginning)
With all of her strength, Helen pulled the lid of the manhole.