Complex sentence: According to Salon.com, by 2001 over half of U.S. medical schools had stopped using live animals for teaching purposes, and by 2006,85% of schools had abandoned the practice.
Split into simpler sentences: According to Salon.com in 2001, over half of U.S. medical schools, had stopped using live animals for teaching purposes. By 2006,85% of schools has abandoned the practice.