Complex sentence: Major John Bowley Quested (14 December 1893--11 March 1948) was an English World War I flying ace credited with eight aerial victories, the most notable of which was over Gustav Leffers.
Split into simpler sentences: Major John Bowley Quested (14 December 1893--11 March 1948) was an British World War I flying ace from England. He was credited with eight aerial victories, the most notable of which was over Gustav Leffers.