Complex sentence: The main traders during Antiquity were the Persians, Romans, Indians and Bactrians, then from the 5th to the 8th century the Sogdians, and during the coming of age of Islam, Arab traders became prominent.
Split into simpler sentences: The main traders during Antiquity were the Persians, Romans, Indians and Bactrians, then from the 5th to the 8th century the Sogdians. During the coming of age of Islam, Arab traders became prominent.