Complex sentence: After completing his studies at the "Ecole des Beaux Arts de Lyon" in 1899 he joined an architectural firm in Paris, where he saw the Clément Ader Avion III, which was displayed at the Paris International Exposition of 1900.
Split into simpler sentences: After completing his studies at the "Ecole des Beaux Arts de Lyon" in 1899 he joined an architectural firm in Paris. Here he saw the Clément Ader Avion III, which was displayed at the Paris International Exposition of 1900.