Complex sentence: For example imagine an auto on/off at night time in all major city office blocks, say after 10pm, when no motion is detected, lights shut down, the company could save kilowatts of wasted overnight energy.
Split into simpler sentences: For example imagine an auto on/off at night time in all major city office buildings, say after 10pm. When no motion is detected, lights shut down, and the owner could save kilowatts of wasted overnight energy.