Complex sentence: Ortal was practically unknown until she battled it out to represent France in the Eurovision Song Contest 2005 when she sang "Chacun Pense à Soi" (Everyone Thinks of Themselves) at the contest in Kyiv.
Split into simpler sentences: Ortal was practically unknown until she battled it out to represent France in the Eurovision Song Contest 2005. Ortal sang "Chacun Pense à Soi" (Everyone Thinks of Themselves) at the contest in Kyiv.