Complex sentence: He served in the state legislature from 1768 to 1774, a colonel in the Continental Army, a delegate to the Rhode Island Constitutional convention in 1790, and as a U.S. Senator from 7 June 1790 to 3 March 1793.
Split into simpler sentences: He served in the state legislature from 1768 to 1774. He was a delegate to the Rhode Island Constitutional convention in 1790, and as a U.S. Senator from 7 June 1790 to 3 March 1793.