重装武器本子库:has been to make

has been to
去过; 曾经去过某地; 到过; 去过......
He has been to Africa.
他到过非洲。
The technique has been to mutate the genes by irradiation or chemicals.
该技术是通过放射线照射或者使用化学方法使基因变异。

Have you ever heard of following expression while learning infinitives:
"James bond is to approach the selected target in Viena."
"The school board is to discuss this issue during next session."
...
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Now you can see the structure;
sb is to do sth
sth is to happen
etc
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which is meant to express sth formal and sometimes imperitive.
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You sentence can well be converted to:
The result is to make entrance harder to amatures.
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And because it describes sth happened and sth still having current effect, the Present Perfect Tense is used.
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period

后面的to make entrance to professional geological journals harder to the amatures整个是一个不定式
因此第一个to是副词,不定式符号

引导不定式短语，作been的表语。

引导make entrance 不作been的表语!