Complex sentence: The Congress of the Confederation created the United States Army on 3 June 1784 and the United States Congress created the United States Navy on 27 March 1794 and the United States Marine Corps on 11 July 1798.
Split into simpler sentences: The Congress of the Confederation created the current United States Army on 3 June 1784. The United States Congress created the current United States Navy on 27 March 1794 and the current United States Marine Corps on 11 July 1798.