"unknown-and ... for-is ..."

“What remains unknown-and may never fully be accounted for-is how much money secretive ‘shadow money’ organizations spent, with some investing massive sums on ads, but also on unreported and purportedly ‘non-political’ activities, as the election neared. It may take years to determine how much they spent.”
More: PressTV - US election costs taxpayers $6bn

Why do we have hyphens in the underlined parts?

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Originally Posted by Odessa Dawn

“What remains unknown-and may never fully be accounted for-is how much money secretive ‘shadow money’ organizations spent, with some investing massive sums on ads, but also on unreported and purportedly ‘non-political’ activities, as the election neared. It may take years to determine how much they spent.”
More: PressTV - US election costs taxpayers $6bn

Why do we have hyphens in the underlined parts?

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I imagine there should be spaces before and after each one, making punctuation dashes. I don't like them, I would have used commas.

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Originally Posted by bhaisahab

I imagine there should be spaces before and after each one, making punctuation dashes. I don't like them, I would have used commas.

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Thank you, bhaisahab, so very much. I think you mean that commas should be used in this way?

“What remainsunknown, and may never fully be accounted for, is how much money ...

Quote:

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Originally Posted by Odessa Dawn

Thank you, bhaisahab, so very much. I think you mean that commas should be used in this way?

“What remains unknown, and may never fully be accounted for, is how much money ...

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Yes.