Complex sentence: He served as a brigadier general in the Continental Army during the Revolutionary War (serving from 1777 until 1779), and represented Rhode Island in the Continental Congress (1780-1781 and 1787).
Split into simpler sentences: He served as a brigadier general in the Continental Army during the Revolutionary War, serving from 1777 until 1779. He represented Rhode Island in the Continental Congress (1780-1781 and 1787).