Complex sentence: His father, the painter Xavier Valls, also born in Barcelona, emigrated to Paris in the late 40's, where he met his wife Luisangela Galfetti, daughter of Swiss architect Aurelio Galfetti.
Split into simpler sentences: His father, the painter Xavier Valls, also born in Barcelona, emigrated to Paris in the late 1940's. There he met his wife Luisangela Galfetti, daughter of Swiss architect Aurelio Galfetti.