Complex sentence: During the 1880s, he obtained important commissions for the artistic decoration of palazzi belonging to the Milan aristocracy, he executed religious works and launched on his career as an illustrator of historical subjects for the Treves publishing house in Milan.
Split into simpler sentences: During the 1880s, he obtained important commissions for the artistic decoration of palazzi belonging to the Milan aristocracy. He also executed religious works, and launched on his career as an illustrator of historical subjects for the Treves publishing house in Milan.