Complex sentence: The teams involved are the 2010 East and West Champions (Russia and Serbia) will compete along with the 2011 Champions (Germany), they will be joined by the 2013 World Cup qualifier (Italy).
Split into simpler sentences: The teams involved are the 2010 East and West Champions (Russia and Serbia) who will compete along with the 2011 Champions (Germany). They will be joined by the 2013 World Cup qualifier (Italy).