Complex sentence: A gang located in the shopping mall and various other parts of the city (they're actually a cult), they are the first gang encountered who use firearms, but are also armed with knives, hatchets, and sickles.
Split into simpler sentences: A gang located in the shopping mall and various other parts of the city. They are the first gang encountered who use firearms, but are also armed with knives, hatchets, and sickles.