Complex sentence: Nicoleta Alexandru (born 5 November 1968), whose stage name is Nicola, is a Romanian singer, best known outside Romania for representing her country at the 2003 Eurovision Song Contest.
Split into simpler sentences: Nicoleta Alexandru (born 5 November 1968), whose stage name is Nicola, is a famous Romanian singer. Outside of Romania, she is remembered for representing her country at the 2003 Eurovision Song Contest.