Take another look at the original sentence:

Wally did not want to do anything to ruin his new pair of athletic shoes, he always stayed on the sidewalks, sidestepped puddles, and made several trips a day to the bathroom to dust the sneakers with toilet paper.

You chose to fix it the correct way:

Wally did not want to do anything to ruin his new pair of athletic shoes, so he always stayed on the sidewalks, sidestepped puddles, and made several trips a day to the bathroom to dust the sneakers with toilet paper.

A perfectly legal move in writing is using a comma and coordinating conjunction like so to connect two main clauses. So shows result; thus, it works perfectly in the example above.

Go to the next sentence.

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