Complex sentence: On October 5,1914, French pilot Louis Quenault opened fire on a German aircraft with a machine gun and the era of air combat was underway as more and more aircraft were fitted with machine guns.
Split into simpler sentences: On October 5,1914, French pilot Louis Quenault opened fire on a German aircraft with a machine gun. The era of air combat proper began as more and more aircraft were fitted with machine guns.