Complex sentence: The pages are much less detailed than in the other codices, and hardly provide any information which is not already in the Dresden Codex; save for its arthistorical value, in a narrow sense, its scientific value is nil.
Split into simpler sentences: The pages are much less detailed than in the other codices, and hardly provide any information which is not already in the Dresden Codex. Save for its arthistorical value, in a narrow sense, the scientific value of this'codex' is nil.