Complex sentence: In 2012, the homicide rate in the USA was 4.7 per 100,000 residents, Canada's was 3 times lower at 1.6, however one should note the chances of being murdered at random are extremely low in both countries.
Split into simpler sentences: In 2012, the homicide rate in the USA was 4.7 per 100,000 residents, Canada's was 3 times lower at 1.6. However one should note the chances of being murdered at random are extremely low in both countries.