Complex sentence: Their trading voyage had convinced them that the best fur country was far to the north and west, and could best be reached by ships sailing into Hudson Bay; and their treatment in Canada suggested that they would not find support for their scheme from France.
Split into simpler sentences: Their trading voyage had convinced them that the best fur country was far to the north and west, and could best be reached by ships sailing into Hudson Bay. Their treatment in Canada suggested that they would not find support for their scheme from France.