Complex sentence: AllJoyn is a system that allows devices to advertise and share their abilities with other devices around them; a simple example would be a motion sensor letting a light bulb know no one is in the room it is lighting.
Split into simpler sentences: AllJoyn is a system that allows devices to advertise and share their abilities with other devices around them. A simple example would be a motion sensor letting a light bulb know no one is in the room it is lighting.