Simplify the following text for a Grade 6 native English-speaking person.
Original: With partner and fiancÃ e Albena Denkova , he is the 2006 & 2007 World Champion , the 2003 & 2004 European silver medalist , and the 2006 â `` 2007 Grand Prix Final champion . Denkova & Staviski are the first Bulgarian figure skaters to medal at the World Figure Skating Championships .
Simplified: Denkova and Staviski are the first Bulgarian skaters to win Worlds , which they did in 2006 and 2007 .