Complex sentence: For instance, even if a small minority of residents wished to vandalise the lifts by scrawling huge graffiti, it would be unlikely because as part of the concierge system, CCTV cameras are operated in every lift.
Split into simpler sentences: For instance, even if a small minority of residents wished to uglify the lifts by scrawling huge graffiti, this would not happen. Because as part of the concierge system, CCTV cameras are operated in every lift.