Complex sentence: A temporary concert stage is erected on the Largo 25 de Abril and for concert is held to celebrate the new year with international bands appearing such as British reggae/pop band UB40 in 2009.
Split into simpler sentences: A temporary concert stage is erected on the Largo 25 de Abril and concerts are held to celebrate the new year. In the past the celebration has seen international bands appearing such as British reggae/pop band UB40 in 2009.