Complex sentence: The Cent-a-meter, known as the electrisave and the Owl in the UK, is an electricity usage monitor featuring a wireless LCD panel allowing the user to move through a building switching on electrical devices and observing their power consumption and energy cost.
Split into simpler sentences: The Cent-a-meter, known as the electrisave and the Owl in the UK, is an electricity usage monitor featuring an indoor wireless display. The user can monitor ongoing energy use, or switch on electrical devices and observing their power consumption and energy cost.