Simplify the following text for a Grade 9 native English-speaking person.
Original: Kessler successfully defended his title against Danilo HÃ ussler , KO3 on October 25 , and against Gusmyl Perdomo ( 16-2 , 10KOs ) , KO4 on 12 September 2009 , one minute into the round .
Simplified: Kessler defended his title against Danilo HÃ ussler , on October 25 , and against Gusmyl Perdomo on 12 September 2009 .