He then combined these simpler isolated substances with other substances to create new products.
译：然后,他将这些简单、分离出来的物质与其他一些物质结合来创造新的物质.
附：isolate vt.使孤立,隔离 adj.孤立的,单独的 n.隔离种群
例句:
Scientists have isolated the virus causing the epidemic.
科学家们已分离出引起这种流行病的病毒.
substance n.物质；实质；大意,要旨；根据
The branch of chemistry that studies and finds ways to use raw materials from farm products to make industrial products is called chemurgy.
译：化学上的一个以研究并利用从农产品中获取的原材料来制造工业产品的分支被称为实用化学.
附：branch n.树枝；分部；分支；支流；分叉
raw material 原材料
chemurgy n.实用化学
All his life Carver battled against the disposal of waste materials,and warned of the growing need to develop substitutes(代用品) for the natural substances being used up by humans.
译：Carver一生致力于与（不当的）处置废料的方法作斗争,并对越来越多的发展替代人类所使用的天然材料的替代物的做法发出警告.
附：battle against
与 ...战斗
例句:
Man is fighting a battle against pollution.
人类正在与污染作斗争.