Complex sentence: Sean "The Cannon" Gannon was a Boston, Massachusetts police officer, and mixed martial arts (MMA) fighter, who gained notoriety on the internet due to a widely distributed video of Gannon defeating Kimbo Slice in an unsanctioned bare-knuckle street fight.
Split into simpler sentences: Sean "The Cannon" Gannon is a Boston, Massachusetts police officer, and mixed martial arts (MMA) fighter. He gained notoriety on the Internet due to a widely distributed video of Gannon defeating Kimbo Slice in an unsanctioned bare-knuckle street fight.