Complex sentence: She is the 2007 world champion on the uneven bars, the 2008 European champion on the uneven bars and the balance beam, and the 2009 European all-around champion.
Split into simpler sentences: She is the 2007 world champion on the uneven bars, and the 2008 European Champion on the uneven bars and the balance beam. Semyonova is the 2009 European all-around champion.