What is the author's style in The Voyage of the "Dawn Treader" by C. S. Lewis?

The language of this novel is concise English and it is very easy to understand. Since the novel is written primarily for children, it is filled with simple sentences and easy to comprehend words. However, there are times when Caspian speaks with his captain or when they run into Aslan or one of his agents that the language becomes somewhat stiff and proper. However, this stiff dialogue is still easy for the reader to understand although it may cause a few younger readers to slow down and review the dialogue more than once.