Complex sentence: Harry Nelson Atwood (1884--1967) was a pioneer aviator who trained at the Wright Company's aviation school at Huffman Prairie, near Dayton, Ohio, with fellow students Thomas Milling, Calbraith Perry Rodgers and "Hap" Arnold.
Split into simpler sentences: Harry Nelson Atwood (1884--1967) was a pioneer aviator. Trained at the Wright Company's aviation school at Huffman Prairie, near Dayton, Ohio with fellow students Thomas Milling, Calbraith Perry Rodgers and "Hap" Arnold.