Complex sentence: O' Connor decided to start boxing at 16 years old at the Framingham Police Athletic League in Framingham, Massachusetts and once he laced up his first pair of boxing gloves he never put them down.
Split into simpler sentences: O' Connor decided to start boxing at 16 years old. He started his training at the Framingham Police Athletic League in Framingham, Massachusetts and once he laced up his first pair of boxing gloves he never put them down.