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こんばんは
自信はありませんが・・・
> Lactose, a sugar present in milk, is one of simple sugars used in food preparations for infants.
(3) of simple →of the simple（one of the simple・・・）
> The brightly colored kingfisher that perches until it sights a fish, then dives into the water to catch its prey
(2) that perches→perches（thatを入れてしまうと
主節の動詞が別に必要になると思います。）
> Copper was the first metal used by humans and is second only to iron into its utility through the ages
(3) into →in？（intoは不自然な気がします。）
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