Complex sentence: For those with more modest budgets, there was the "Bouillon", a type of restaurant begun by a butcher named Duval in 1867, which served simple and inexpensive food, and were popular with students and visitors.
Split into simpler sentences: For those with more modest budgets, there was the Bouillon, a type of restaurant begun by a butcher named Duval in 1867. These establishment served simple and inexpensive food and were popular with students and visitors.