Complex sentence: The event was held at the Iceberg Skating Palace in Sochi, Russia from December 6--9,2012, it was a test event in anticipation of the 2014 Winter Olympics in Sochi.
Split into simpler sentences: The event was held at the Iceberg Skating Palace in Sochi, Russia from December 6--9,2012. It was a test event in anticipation of the 2014 Winter Olympics in Sochi.