Complex sentence: Widespread rumors ensued to the effect that Klitschko was going to fight David Haye for a unification bout, instead of Chisora, but on January 6 it was announced that the Klitschko-Chisora fight had been re-scheduled for April 30,2011.
Split into simpler sentences: Widespread rumors ensued to the effect that Klitschko was going to fight David Haye for a unification bout, instead of Chisora. It seemed that a unification fight was going to happen, but on January 6 it was announced that the fight between Wladimir Klitschko and Dereck Chisora was re-scheduled for April 30,2011.