Compound sentences have two independent sentences linked by words ( connectors) or punctuation marks. The parentheses mark each independent sentence and the bold-typed style marks the connector.
(The French drink strong black coffee mixed with hot milk) ; ( the Italians drink small cups of espresso.)
According to my Spanish teacher, (Basques have a unique culture), and (their language is unrelated to any other world language.)
(My aunt and uncle love to travel in their camper), and (they can stop wherever they want to.)