Complex sentence: Charles-Louis Clérisseau (28 August 1721--9 January 1820), the French architectural draughtsman, antiquary, and artist, occupies a unique position in the genesis of neoclassical architecture during the second half of the 18th century.
Split into simpler sentences: Charles-Louis Clérisseau (28 August 1721--9 January 1820) was a French architectural draughtsman, antiquary and artist. He had a role in the genesis of neoclassical architecture during the second half of the 18th century.