Complex sentence: As regards choral bands, Mocedades from Bilbao should be highlighted, founded in 1967 initially by Amaya Uranga and two sisters; they soon gain public notability by ranking second at the 1973 Eurovision Song Contest.
Split into simpler sentences: As regards choral bands, Mocedades from Bilbao should be highlighted, founded in 1967 initially by Amaya Uranga and two sisters of her. They soon gained public notability by ranking second at the 1973 Eurovision Song Contest.