Complex sentence: LEDs consume one fifth of the energy of conventional bulbs (incandescent) and last one hundred times longer and while LEDs can be more expensive than incandescent, they use less energy and are more cost effective.
Split into simpler sentences: LEDs consume one fifth of the energy of conventional bulbs (incandescent) and last one hundred times longer. While LEDs can be more expensive than incandescent, they use less energy and are more cost effective.