Complex sentence: Before studying acting, he considered a career as an artist, but eventually commenced acting studies in Geneva, followed by the Paris Conservatoire, alma mater of Jean-Paul Belmondo, and completed his training at L'École des Amandiers in Nanterre.
Split into simpler sentences: Before studying acting, he considered a career as an artist. But eventually commenced acting studies in Geneva, followed by the Paris Conservatoire, alma mater of Jean-Paul Belmondo, and completed his training at L'École des Amandiers in Nanterre.