Complex sentence: Nerra submitted the track to the Selecția Națională 2017, a show to choose Romania's entry at the Eurovision Song Contest 2017, where she advanced in sixth place to the final round.
Split into simpler sentences: Nerra submitted the track for the Selecția Națională 2017, a show to choose Romania's entry at the Eurovision Song Contest 2017. There, she advanced in sixth place to the final round.