Inventions, discoveries and scientific knowledge by themselves do not necessarily benefit people; only if they are incorporated into a designed product will a benefit be derived.
答：你漏抄了一大截!现补上.
还要分析吗?
前一句,说A、B、C本身并不一定对人有益处.
后一句是only +状语放句首,引起句子的倒装.不倒装则为：
A benefit will be derived only if -从句.
意为：只有在.的条件下,才有好处从中而来.