Complex sentence: Vomiting (throwing up), belching (burping) and spitting during meals were approved of in Roman manners.They used to eat until they vomited because it showed hoW rich they were to the poor.
Split into simpler sentences: Vomiting (throwing up), belching (burping) and spitting during meals were approved of in Roman manners. They would eat and eat and eat until they vomited because it showed how rich they were to the poor.