Complex sentence: While there, Glisson was asked to participate in the wedding of Charles Allen Perkins, attaché for the American Legation, to the Princess Dona Maria Isabella Francoise de Bourbon, granddaughter of King Charles IV of Spain and living in exile in Portugal.
Split into simpler sentences: While there, Glisson was asked to participate in the wedding of Charles Allen Perkins, attaché for the American Legation. The bride was the Princess Dona Maria Isabella Francoise de Bourbon, granddaughter of King Charles IV of Spain and exiled in Portugal.