Complex sentence: His passion for the arts led to his giving up his financial career, but using his business acumen he became an art dealer and in 1907 opened his own gallery at 28 rue Vignon in Montparnasse.
Split into simpler sentences: His passion for the arts led to his giving up his financial career. Using his business acumen, he became an art dealer and in 1907 opened his own gallery at 28 rue Vignon in Montparnasse.