Complex sentence: In about 300 BC, the pastry cook became an occupation for Romans (known as the pastillarium) and became a respected profession because pastries were considered decadent, and Romans loved festivity and celebration.
Split into simpler sentences: In about 300 BC, the pastry cook became an occupation for Romans (known as the pastillarium). This became a respected profession because pastries were considered decadent, and Romans loved festivity and celebration.