Complex sentence: On October 16,2010, he took part in the first round of the Ultimate Glory 2010/11 World Series at "Ultimate Glory 12" where defeated German veteran Stefan Leko via technical knockout as Leko retired in the second round.
Split into simpler sentences: On October 16,2010, he took part in the first round of the Ultimate Glory 2010/11 World Series at "Ultimate Glory 12". He defeated German veteran Stefan Leko via technical knockout as Leko retired in the second round.