Complex sentence: Upon graduation in 1916, Bartini was sent to Russian-Austrian-Hungarian front where he was captured in June 1916, flying school in 1921 and Politecnico di Milano in 1922.
Split into simpler sentences: Upon graduation in 1916, Bartini was sent to the Russian-Austrian-Hungarian front where he was captured in June 1916. He attended flying school in 1921 and Politecnico di Milano in 1922.