What is the author's style in The Way to Rainy Mountain by N. Scott Momaday?

For the most part the language of the story is straight forward and easily understood. The author does not use big words that require clarification for understanding. Any questions the reader may propose are usually addressed by the factual information of the second paragraph. Only a few questions remain unanswered. The first is the identity of Mooney whose name appears at the end of several of the second paragraphs. The second question involves Kotsatoah mentioned in Chapter 15. Apparently, this Indian was important enough to be painted by a famous artist but the reader may not be familiar with the artist or his subject.