Complex sentence: Many companies with controversial reputations are better off leaving Wikipedia alone and those with positive reputations may shy away if our participation would result in "that one thing" being added that executives are sensitive about.
Split into simpler sentences: Many companies with controversial reputations are better off leaving Wikipedia alone and so on. Even reputable companies with positive reputations will often shy away if the article may include "that one thing" that their executives are sensitive about.