Complex sentence: However, such expectations were left unrealized by the effects of the actual treaty, and soon after the treaty came into effect, it became apparent that greater combined returns had not necessarily been achieved than had each country continued operating independently.
Split into simpler sentences: However, such expectations were left unrealized by the effects of the actual treaty. Soon after the treaty came into effect, it became apparent that greater combined returns had not necessarily been achieved than had each country continued operating independently.