What is the author's style in The Silver Chair by C. S. Lewis?

The language of the novel is clear English that is not difficult for the reader to understand. There are times when the writer uses terms that are unfamiliar to the reader, such as Marsh-wiggle, which is the name of Puddleglum's species, or Harfang, the name of the giant's castle. These terms, though unfamiliar to the reader, are explained within the text or placed in the exposition in such a way that the reader has no trouble understanding its meaning.