Complex sentence: The 2009 World Gathering was held outside Murchison, New Zealand, 2011 in Argentina, 2012 in Brazil and, in 2013, it was once again held in Canada, on Vancouver Island in the western province of British Columbia.
Split into simpler sentences: The 2009 World Gathering was held outside Murchison, New Zealand and the 2011 World Gathering was held in Argentina. In 2012 it was held in Brazil and in 2013 it was once again held in Canada, on Vancouver Island in the western province of British Columbia.