Complex sentence: This was the country ruled by the Wicked Witch of the West before Dorothy "melted" her with a bucket of water in "The Wonderful Wizard of Oz"; since then, the Tin Woodman ruled over the Winkies as their Emperor.
Split into simpler sentences: This was the country ruled by the Wicked Witch of the West before Dorothy "melted" her with a bucket of water in "The Wonderful Wizard of Oz". Since then, the Tin Woodman ruled over the Winkies as their Emperor.