Complex sentence: Doughty became captain in the 2d Continental Artillery in January 1777 and served as aide to Major General Philip Schuyler, later he was assigned to command the New York State company of artillery in March 1777.
Split into simpler sentences: Doughty became captain in the 2d Continental Artillery in January 1777 and served as aide to Major General Philip Schuyler. Later, he was assigned to command the New York State company of artillery in March 1777.