Complex sentence: Following feedback from their use in various international tournaments, extensive reviews took place prior to the issue of version two in November 2010, which was used at the 2011 World Scrabble Championship in Warsaw, Poland, and other international events such as the Causeway Challenge.
Split into simpler sentences: Following feedback from their use in various international tournaments, an extensive review took place prior to the issue of version two in November 2010. Version two was used at the 2011 World Scrabble Championship in Warsaw, Poland, and other international events such as the Causeway Challenge.