Complex sentence: On November 22,2011, Google announced that Knol was phased out in favor of Annotum, it would be closed on April 30,2012 and all content would be deleted by October 1,2012.
Split into simpler sentences: On November 22,2011, Google announced that Knol was phased out in favor of Annotum. It would be closed on April 30,2012 and all content would be deleted by October 1,2012.