Complex sentence: Between 1925 and 1928, Gustaitis studied aeronautical engineering in Paris and after his graduation returned to Lithuania, and was promoted to deputy Commander-in-Chief of Military Aviation and was made chief of the Aviation Workshop (Karo Aviacijos Tiekimo Skyrius) in Kaunas.
Split into simpler sentences: Between 1925 and 1928, Gustaitis studied aeronautical engineering in Paris. After his graduation he returned to Lithuania, and was promoted to deputy Commander-in-Chief of Military Aviation and made chief of the Aviation Workshop (Karo Aviacijos Tiekimo Skyrius) in Kaunas.