菜鸟求助！Prep08-219,GWD-12_Q20的正确句子结构理解

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Approved April 24, 1800,the act of Congress that made provision for the removal of the government ofthe United States to the new federal city, Washington, D.C., also established the Library of Congress.
A.    Approved April 24, 1800, the act of Congress that made provision for theremoval of the government of the United States to the new federal city,Washington, D.C., also established
B.    The act of Congress, which was approved April 24, 1800, making provisionfor the removal of the government of the United States to the new federal city,Washington, D.C., also established
C.    The act of Congress approved April 24, 1800, which made provision forthe removal of the government of the United States to the new federal city,Washington, D.C., and established
D.    Approved April 24, 1800,making provision for the removal of the government of the United States to thenew federal city, Washington, D.C., the act of Congress also established         
E.    Approved April 24, 1800, the act of Congress made provision for theremoval of the government of the United States to the new federal city,Washington, D.C., also establishing


OA 是 A，我做题时错选了E，理解了E的错误但是对于A的句子结构仍有疑惑


在Manhattan Prep上看到Ron这样表述A的句型：

that is, indeed, an independent clause. the problem is that it's a very long independent clause - the 'middleman' itself is longer than most actual sentences. that's a doozy.
remember that you should either condense or eliminate these interloping constructions (modifiers, prepositional phrases, and the like) so that you can better understand the structure of the sentence. if you do that here, you get the following:
the act that did X ... also did Y
that's an independent clause.


A选项的句型里，全句的谓语动词难道是Approved嚒？that引导限定性定语从句 that made....,also established...
句子是否能还原为 The act of Congress that made provision for theremoval of the government of the United States to the new federal city,Washington, D.C., also established the Library of Congress was appoved April 24,1800.
如果是这里的Approved的提前，以及省略掉was是什么用法呢？求明眼的CD前辈指导。。。。。或者 句子是 The act of Congress that made provision for theremoval of the government of the United States to the new federal city,Washington, D.C. was appoved April 24,1800，also established the Library of Congress.为了避免RUN-ON把Approved放在前面做修饰？

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Mark一下！               

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