[Grammar] While A once B, C

[kadioguy]

We decided to snap a few side-by-side shots with the Galaxy S8 and then compare those to downscaled 12MP samples taken with the Compact. While the 12MP images by the Sony look indeed better once resized to lower resolution, they still aren't a match for the Galaxy S8's.

http://www.gsmarena.com/sony_xperia_xz1_compact-review-1660p8.php
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Is the sentence in blue grammatically correct?
(While A once B, C)

If not, could you correct it?

 

[GoesStation]

Indeed is misplaced and wouldn't be natural anyway. Replace "look indeed better" with do look better and you'll have a grammatical sentence.

Replace "those" with them in the first sentence.

 

[kadioguy]

We decided to snap a few side-by-side shots with the Galaxy S8 and then compare them to downscaled 12MP samples taken with the Compact. While the 12MP images by the Sony do look better once resized to lower resolution, they still aren't a match for the Galaxy S8's.
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I remember that my English teacher told us in class that 'Because A so B' is not grammatical, so from then on I think two subordinate conjunctions in one sentence will be a grammatical error. This is why I asked this question.

So is 'While A once B, C' grammatical?

 

[probus]

I think your teacher must have meant that "Because A so B" is a very inferior equivalent to "If A then B".