Complex sentence: The book was widely praised for its insider depiction of Vietnam, its people and culture, and how the French forces were unable to adequately comprehend the'people's war' the Vietnamese were fighting.
Split into simpler sentences: The book was widely praised for its insider depiction of Vietnam, its people and culture. Especially, it recounted how the French forces were unable to adequately comprehend the'people's war' their Vietnamese foes were fighting.