Complex sentence: Aldous Huxley wrote an English biography of Leclerc entitled "Grey Eminence", and there is also an 1873 painting by Jean-Léon Gérôme, "L'Éminence Grise," which depicts him descending the grand staircase of the Palais Cardinal.
Split into simpler sentences: Aldous Huxley wrote an English biography of Leclerc entitled "Grey Eminence". There is also an 1873 painting by Jean-Léon Gérôme, "L'Éminence Grise", which depicts him descending the grand staircase of the Palais Cardinal.