Complex sentence: The wine trade in Italy consisted of Rome's sale of wine abroad to settlements and provinces around the Mediterranean Sea, yet by the end of the 1st century AD, its exports had competition from the provinces, themselves exporters to Rome.
Split into simpler sentences: The wine trade in Italy consisted of the Romans selling their wine abroad to settlements and provinces around the Mediterranean Sea. Yet, by the end of the 1st century CE/AD, the Romans wine exports had competition from its provinces, which began to export their wine to Rome.