Complex sentence: In 2000, crime had dropped to a 20-year low with 3,166 total crimes tracked by the Crime Reporting Unit of the Massachusetts State Police, of which 789 were violent crimes (the lowest violent crime rate since 1975), and 2,377 were property crimes.
Split into simpler sentences: In 2000, crime had dropped to a 20-year low. Some 3,166 total crimes tracked by the Crime Reporting Unit of the Massachusetts State Police, of which 789 were violent crimes (the lowest violent crime rate since 1975), and 2,377 were property crimes.