Complex sentence: Following the altercation in the parking lot, more than 300 Caledonia residents gathered at the Canadian Tire lot before moving to a nearby school yard adjacent to the construction site, where some clashed with OPP officers in full riot gear.
Split into simpler sentences: Following the altercation in the parking lot, more than 300 Caledonia residents gathered at the Canadian Tire lot. Moving to a place near the construction site, some clashed with OPP officers in full riot gear.