@Lustig Andrei,
Thank you for answering my question.
However, I still do not understand why my sentence (from Your Dictionary) is technically correct. I always thought that you are not able to join main clauses together with just a comma. I think it’s is called comma splice. All the clauses in my sentence have a subject and verb, and only the last clause has a coordinating conjunction to make it a subordinate clause. All the other clauses seem to be independent clauses, which makes them main clauses? Ahhhh, I really am confused!
Betty gets home at 5:30, she and her husband have dinner together, they watch TV for a few hours, and they go to bed around 11:00.