Complex sentence: Boston is a compact city, sized right for walking or bicycling and according to a "Prevention" magazine report in 2003, the city has the highest percentage of on-foot commuters of any city in the United States.
Split into simpler sentences: Boston is a compact city, sized right for walking or bicycling. According to a "Prevention" magazine report in 2003, the city has the highest percentage of on-foot commuters of any city in the United States.