Complex sentence: Even the state-of-art instruments can only measure D/H ratios with around 50 ~ 200 ‰ error depending on the compound., which means that it can only distinguish the large D/H variations in preserved materials.
Split into simpler sentences: Even the state-of-art instruments can only measure D/H ratios with around 50 ~ 200 ‰ error depending on the compound. Therefore, so far technique can only distinguish the large D/H variations in preserved materials.