不解求教.. OG12-SC-48

48. In 1713, Alexander Pope began his translation of the
Iliad, a work that, taking him seven years until
completion, and that literary critic Samuel Johnson,
Pope’s contemporary, pronounced the greatest
translation in any language.
(A) his translation of the Iliad, a work that, taking
him seven years until completion, and that
literary critic Samuel Johnson, Pope’s
contemporary, pronounced
(B) his translation of the Iliad, a work that took him
seven years to complete and that literary critic
Samuel Johnson, Pope’s contemporary,
pronounced
(C) his translation of the Iliad, a work that had taken
seven years to complete and that literary critic
Samuel Johnson, Pope’s contemporary,
pronounced it as
(D) translating the Iliad, a work that took seven
years until completion and that literary critic
Samuel Johnson, Pope’s contemporary,
pronounced it as
(E) translating the Iliad, a work that had taken seven
years to complete and literary critic Samuel
Johnson, Pope’s contemporary, pronounced it

答案是B.只是OG中对于选项E的说明the coordinating conjunction introduces inappropriate emphasis on Johnson's description, and the expression is awkward and unclear有些不明白。

1）为何有了coordinating conjunction 之后就会出现inappropriate emphasis 呢？

2） E选项中的 a work that had taken seven years to complete and literary critic Samuel Johnson 和 B选项中的 a work that took him seven years to complete and that literary critic Samuel Johnson 在语法结构上和语义上区别在哪里呢？

还望路过的大侠指点迷津呀！！