I have seen the above construction only twice online, but it sounds like one
of those sentences where the word order has been moved around in order to give
it maybe a Shakespearean effect, or samurai effect or who knows.

> 無謀とも言えるその計画に誰もが驚き、掲示板で彼の足どりを確かめ応援し続けました。

* * *

> いまだ成功した者はいない
>
> 「禁断の地」への冒険
>
> ムボウとも言えるその計画にいどむ
>
> フォン・ミュラー氏とバレル博士が･･･

I think it means, " reckless can be said that plan to challenge", but that
obviously makes no sense.
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grammar translation relative-clauses anime
無謀とも言えるその計画に (Reckless can be said that plan to)
### The whole text

I suspect this might be easier to parse if we view this as a single piece of
text, rather than four statements.

> いまだ成功した者はいない「禁断の地」への冒険、ムボウとも言えるその計画にいどむフォン・ミュラー氏とバレル博士が･･･

This is complicated grammar, but essentially this is a long descriptive set of
dependent clauses that all modify the subjects of the sentence,

> フォン・ミュラー氏とバレル博士

Working backwards from the subject, we see that they are 挑む-ing a 計画.
Everything before the 計画 is one long clause modifying (describing) the noun
計画:

> いまだ成功した者はいない「禁断の地」への冒険、ムボウとも言えるその計画

A direct translation of this whole text would be clunky as all get out.

> いまだ成功した者はいない  
>  Yet succeeded person there isn't → no one has yet succeeded
>
> 「禁断の地」への冒険  
>  Adventure to the "forbidden land"
>
> ムボウとも言えるその計画にいどむ  
>  Taking on a plan that could be called reckless
>
> フォン・ミュラー氏とバレル博士が･･･  
>  Von Müller and Professor Barrel are ...

... But as you can see, if we translate it as chopped-up bits, it loses all
flow and is quite difficult to understand in the English.

Handled as a single text then:

> Von Müller and Professor Barrel are [に挑む → daring to take on] what [とも言える →
> could be called] a reckless plan, an adventure to a forbidden land
> [いまだ成功した者はいない → literally, "no one has yet been successful", or
> idiomatically → from which no one has returned] ...

### The construction `XX とも言える YY`

The crux of your question seems to be about this construction. This basically
boils down to _"YY, which could be called XX..."_

### A note about localizing

The translation you provided from the "reporter" takes some liberties with the
text, but this is generally unavoidable with localization, where the goal is
to produce a target text that reads like something written natively in the
target language. For languages as far apart structurally and idiomatically as
English and Japanese, localizing almost invariably means some deviance in word
choice and construction.
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answer