Complex sentence: There was a demonstration in ordinary clothes at the Prize press launch on November 6, and another demonstration in clown costume on the Prize ceremony day, December 9: this reached a worldwide TV audience, when it was syndicated by Reuters.
Split into simpler sentences: There was a demonstration in ordinary clothes at the Prize press launch on 6 November. Another demonstration took place on the Prize ceremony day, 9 December: this reached a worldwide TV audience, when it was syndicated by Reuters.