Complex sentence: The two discover the ruined Yellow Brick Road, which leads them to the Emerald City, now in ruins, missing its emeralds, and all of its citizens, including the Tin Woodman and Cowardly Lion, turned to stone.
Split into simpler sentences: The two discover the Yellow Brick Road, which leads them to the Emerald City, now in ruins. All of its citizens, including the Tin Woodman and Cowardly Lion, have been turned to stone.