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)

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)

Because he had worked at the construction site all day, Tom decided not to meet his friends at the dinner for he was too tired to think.