Complex sentence: This tour saw the end of the Greek occupation of Smyrna and the ratification of the Treaty of Lausanne by Turkey saw a draw-down of U.S. naval forces in the region, reducing Bristol's post to a primarily diplomatic one.
Split into simpler sentences: This tour saw the end of the Greek occupation of Smyrna. The ratification of the Treaty of Lausanne by Turkey resulted in a draw-down of U.S. naval forces in the region, reducing Bristol's post to a primarily diplomatic one.