Complex sentence: This technique is applied with web banners, text links, email, and opt-in e-mail advertising, although opt-in e-mail advertising is more commonly charged on a cost per action (CPA) basis although sometimes CPM is used.
Split into simpler sentences: This technique is applied with web banners, text links, email, and opt-in e-mail advertising. Although opt-in e-mail advertising is more commonly charged on a cost per action (CPA) basis, sometimes CPM is used.