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

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.

Right.

Thank you...

That answer is wrong. The sentence is supposed to be rewritten as

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

Your rewritten sentence, "While I was researching skateboards, I found an interesting old newspaper story," is correct. By placing a comma after "skateboards," you are separating the dependent clause "While I was researching skateboards" from the main clause "I found an interesting old newspaper story." This comma indicates a pause in the sentence, improving its clarity and proper grammatical structure. Great job!