Complex sentence: Many costumes involve male and female or group versions and are based on old Venetian characters and costumes or on modern themes, the elaborate costumes and masks are handmade by artisans from various countries.
Split into simpler sentences: Many costumes involve male and female or group versions and are based on old Venetian characters and costumes or on modern themes. The elaborate costumes and masks are handmade by artisans from various countries.