Complex sentence: After baccalauréat, he studied in Paris first at "Lycée Henri IV" and then at École Normale Supérieure (from which he graduated in 1930) and "École libre des sciences politiques".
Split into simpler sentences: After baccalauréat, he studied in Paris first at "Lycée Henri IV". He then entered the École Normale Supérieure in 1930 and the "École libre des sciences politiques".