Except the article was about the experiment that disputes that theory.这句话Except the article做主语，还是article was后面是个从句，article （that）was。如果是后者的话，句子可以写成Except the article about the experiment that disputes that theory.这样不更简洁？
Except the article was about the experiment that disputes that theory.
这不是完整的句子，而只是except （that）引导的除外状语从句。except that可以分析为连词，that可以省略。这里没有主句。
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