Complex sentence: The Franks won out at the end of the 7th century and closely monitored the growth of Dorestad, which led to Dorestad's economic expansion via international trade and the establishment of a mint in the Upper town.
Split into simpler sentences: The Franks won out at the end of the 7th Century and closely monitored the growth of Dorestad. This led to Dorestad's economic expansion via international trade and the establishment of a mint in the Upper town.