What is the author's style in The Sign of the Beaver by Elizabeth George Speare?

The language is written to be easily understood by young students. There are no difficult words, and those in the Indian tongue are fully addressed and defined. These words, which generally are spoken by Saknis or Attean, are often used multiple times so that the reader can grasp their meaning easily by the end of the book. There are not so many of these that the train of thought is interrupted.