Complex sentence: Winnipeg's gang activity consists heavily of Aboriginal criminals, with a smaller number of other ethnic groups namely European, East Asian (Filipino/Vietnamese) and African gangs; it has been described as the Aboriginal gang capital of Canada.
Split into simpler sentences: Winnipeg's gang activity consists heavily of Aboriginal criminals, with a smaller number of European, East Asian (Filipino/Vietnamese) and African gangs. It has been described as the Aboriginal gang capital of Canada.