Complex sentence: However, the coloratura contralto roles (some of them trouser roles) in Rossini's operas have been central to her repertoire where critics have noted the expressive power of her voice and her ability to cope with the florid singing demanded of Rossini's heroes and heroines.
Split into simpler sentences: However, the coloratura contralto roles (some of them trouser roles) in Rossini's operas have been central to her repertoire. Critics have noted the expressive power of her voice and her ability to cope with the florid singing demanded of Rossini's heroes and heroines.