Complex sentence: Zelmerlöw once again participated in Melodifestivalen in 2015 with the song "Heroes", after winning the final he will represent Sweden in the Eurovision Song Contest 2015 in Vienna, Austria.
Split into simpler sentences: Zelmerlöw once again participated in Melodifestivalen in 2015 with the song "Heroes". After winning the final he will represent Sweden in the Eurovision Song Contest 2015 in Vienna, Austria.