Original sentence: Consumer Reports claims objectivity and freedom from bias, although a few companies have challenged this in court.Consumer Reports does not print outside advertising or permit the commercial use of its reviews for selling products, and it states that this eliminates one possible source of bias
Edited sentence: Consumer Reports claims objectivity and freedom from bias, although a few companies have challenged this in court , and their primary argument - that it does not print outside advertising or permit the commercial use of its reviews for selling products - cannot, in itself, remove all sources of bias