Complex sentence: Billy is a 8 year old happy-go-lucky child and the main protagonist with an extremely low IQ of -5, having been outperformed by a shovel and 2 candy bracelets on an IQ test.
Split into simpler sentences: Billy is an 8-year-old happy-go-lucky child and the main protagonist. He has an extremely low IQ of -5, having been outperformed by a shovel and two candy bracelets on an IQ test.