Complex sentence: Hers was the first of the Parisian literary salons to which distinguished foreigners were admitted, and among her English guests were Henry St John, 1st Viscount Bolingbroke and Philip Stanhope, 4th Earl of Chesterfield.
Split into simpler sentences: Hers was the first of the Parisian literary salons which admitted distinguished foreigners. Among her English guests were Henry St John, 1st Viscount Bolingbroke and Philip Stanhope, 4th Earl of Chesterfield.