While I was researching skateboards I found an interesting old newspaper story.

Question

We need to rewrite the sentence placing commas where necessary.
I wrote it like this...
While I was researching skateboards, I found an interesting old newspaper story.

Answer 1

Right.

Answer 2

Thank you...

Answer 3

That answer is wrong. The sentence is supposed to be rewritten as
"While I was researching skateboards I found an interesting, old, newspaper story."