Complex sentence: Aberdeen and Dundee had close links to Baltic ports in Poland and Lithuania where Scottish merchant traded, so it is possible that Jews may have come to Scotland to do business with their Scottish counterparts, although no direct evidence of this exists.
Split into simpler sentences: Aberdeen and Dundee had close links to Baltic ports in Poland and Lithuania where Scottish merchants traded. It is possible therefore that Jews may have come to Scotland to do business with their Scottish counterparts, although no direct evidence of this exists.