Complex sentence: His "Histoire critique de l'école d'Alexandrie" (3 vols.1846-51), his first and best-known work, drew on him attacks from the Clerical party which led to his suspension in 1851.
Split into simpler sentences: His "Histoire critique de l'école d'Alexandrie" (3 vols.1846-51), was his first and best-known work. It drew on him attacks from the Clerical party which led to his suspension in 1851.