这句话应该有断句的
In case where the explanation is unknow,the scientific point of view is that there is a reason if it can only be discovered.
逗号以前的作原因状语,
the scientific point of view是主语,
is是谓语动词
that引导表语从句there is a reason if it can only be discovered
if it can only be discovered 是条件状语从句