Complex sentence: Jerome-Martin Langlois (Paris, March 11,1779-Paris, December 28,1838) received his training in the studio of Jacques-Louis David, the leading Neoclassical French painter, and became one of his favorite students.
Split into simpler sentences: Jerome-Martin Langlois (March 11,1779--December 28,1838) was a French Neoclassical painter. He received his training in the studio of Jacques-Louis David, the leading Neoclassical French painter, and became one of his favorite students.