Complex sentence: Marguerite Olagnier (née Joly) (1844-1906) was a French singer and composer who sang at the Théâtre des Variétées in Paris and became director of the Théâtre de l'Oratorio.
Split into simpler sentences: Marguerite Olagnier (née Joly) (1844-1906) was a French singer and composer. She sang at the Théâtre des Variétées in Paris and became director of the Théâtre de l'Oratorio.