Complex sentence: In the rematch, K9 made a statement in showing Powell that their fight years ago was indeed a fluke by winning a 12 round onesided victory, which avenged his defeat, winning by unanimous decision over Powell.
Split into simpler sentences: In the rematch K9 made a statement in showing Powell that their fight years ago was indeed a fluke. By winning a 12 round onesided victory, which avenged his defeat, winning by unanimous decision over Powell.