Complex sentence: Recognized by the Guinness Book of World Records as the "World's Largest Robot Competition", the RoboGames (formerly ROBOlympics) host over 70 different events and are modeled on the human Olympics.
Split into simpler sentences: Recognized by the Guinness Book of World Records as the World's Largest Robot Competition. RoboGames-formerly ROBOlympics-hosts over 70 different events and is modeled on the human Olympics.