Complex sentence: Arangi-Lombardi applied a bel canto technique at the service of a beautiful and grand voice in a way that was rare in Mediterranean sopranos of her time, who tended to be schooled in verismo methods.
Split into simpler sentences: Arangi-Lombardi possessed a bel canto technique which she applied at the service of a beautiful and grand voice. This combination was rare in Mediterranean sopranos of her time, who tended to be schooled in verismo methods.