Furthermore, he (a successful scientist) is not only critical of the work of others,but also of his own, since he knows that man is the least reliable of scientific
instruments and that a number of factorstend to disturb impartial and objective investigation.
这个句子的主句是he …his own。从句是since引导的原因状语从句
从句一般都有引导词或者叫连接词、关联词。如果没有就看句子成分,如果一个句子中出现两个或以上的主谓宾或者其他完整的句子类型,那就要判断是否是从句。
如:
I know he is a farmer. 其中
he is a farmer做主句谓语动词know的宾语,所以是一个宾语从句。
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