Complex sentence: The title of Obama's 2006 memoir, "The Audacity of Hope", was inspired by one of Wright's sermons, which was also a theme of Obama's 2004 keynote address to the Democratic National Convention.
Split into simpler sentences: The title of Obama's 2006 memoir, "The Audacity of Hope", was inspired by one of Wright's sermons. This sermon also was the source for themes of Obama's 2004 keynote address to the Democratic National Convention.