Peter and Carl walk to school, and Bonnie follows them.(short sentence)

Bonnie is Peter's dog. She is a nice dog.(long sentence)

She walks at Peter's heels. She turns back at the butcher's shop.(long sentence)

Now Bonnie may try to find her friends, or she may go home.(short sentence)

Tom had worked at the construction site all day. He dicided not to meet his friends at the dinner. Because he was too tired to think.（compound-complex sentence)

The projector broke for a second time. Some people in the audience hissed. The others shouted for a refund.（compound-complex sentence)

You are sent damaged goods. The store must replace the items. Otherwise, it must issue a full refund.（compound-complex sentence)

Sears had the outdoor grill I wanted. The clerk wouldn't sell it to me. It was the food sample.（compound-complex sentence)

She wanted to go to the party. She had to stay at home to look after her younger sister.(long sentence)

Tony washed his car in the morning. He repaired his house in the afternoon.(long sentence)