Complex sentence: After the tournament, Takahashi returned to action on at the event "Shoot Boxing World Tournament 2010", where she faced and defeated in dominant fashion America mixed martial artist Karina Hallinan by unanimous decision after three rounds.
Split into simpler sentences: After the tournament, Takahashi returned to action on at the event "Shoot Boxing World Tournament 2010". She faced and defeated in dominant fashion American mixed martial artist Karina Hallinan by unanimous decision after three rounds.