Complex sentence: He served under George Washington and Henry Lee during the war, and at its conclusion, by then a lieutenant colonel, was chosen by Congress in 1784 to relay the ratified Treaty of Paris (1783) to commissioner Benjamin Franklin in Paris.
Split into simpler sentences: He served under George Washington and Henry Lee during the war. A lieutenant colonel at its conclusion, he was chosen by Congress in 1784 to relay the ratified Treaty of Paris (1783) to commissioner Benjamin Franklin in Paris.