Complex sentence: J2 is sporadically detected in North Africa and Iberia and is very frequent in the Levant/Anatolia/Iran region and its spread in the Mediterranean is believed to have been facilitated by the maritime trading culture of the Phoenicians (1550 BC-300 BC).
Split into simpler sentences: J2 is sporadically detected in North Africa and Iberia and is very frequent in the Levant/Anatolia/Iran region. Its spread in the Mediterranean is believed to have been facilitated by the maritime trading culture of the Phoenicians (1550 BC-300 BC).