What is the author's style in The River Between by Ngugi wa Thiong'o?

The story is written in third person and the majority is presented in the limited omniscient perspectives of Waiyaki and Nyambura. The story spends the majority of the time in Waiyaki's point of view though there are times when the reader leaves Waiyaki and sees the story unfold from Nyambura's perspective. The limit is not a problem and necessary information is provided merely as background. For example, the book opens with the lore of the region, which is largely just historical information though it later plays into the story line when Chege reveals that Waiyaki has a role in that traditional lore. For the majority of the book, the reader sees the village, the tribe and its problems from Waiyaki's perspective. There are, however, several chapters seen only from Nyambura's perspective. The first of these is when Nyambura and her sister, Muthoni, are going to the river for water. Waiyaki is not there and the only way for the reader to get this information is to leave Waiyaki's perspective, as the author has done.