Complex sentence: He served as the Professor of philosophy at the College de Troyes from 1925 to 1928 then joined the Faculty of Arts at the University of Lille between 1929 and 1940 then with the University of Bordeaux during1940 and 1941.
Split into simpler sentences: He served as the Professor of philosophy at a "lycée" in Troyes from 1925 to 1928. Then he taught at the Faculty of Arts at the University of Lille between 1929 and 1940; subsequently, he taught at the University of Bordeaux during 1940 and 1941.