Complex sentence: On 25 May 2013, Cezar will perform alongside Andrea Bocelli and Angela Gheorghiu at the Andrea Bocelli's concert in Romania at the Romexpo, as well as a single written especially for him by the legend of electronic music, Vangelis.
Split into simpler sentences: On 25 May 2013, Cezar performed alongside Andrea Bocelli and Angela Gheorghiu at the Andrea Bocelli's concert in Romania at the Romexpo. As well as this, he will also release a single written especially for him by the legend of electronic music, Vangelis.