Complex sentence: The "Dawn Treader" was a Narnian ship, built by King Caspian X, in the "Chronicles of Narnia", and is featured primarily in the book "The Voyage of the" Dawn Treader.
Split into simpler sentences: The "Dawn Treader" was a Narnian ship in the fictional world of "Chronicles of Narnia". It was built by King Caspian X and is featured primarily in the book "The Voyage of the" Dawn Treader.