Complex sentence: This technique is applied with web banners, text links, e-mail spam, and opt-in e-mail advertising, although opt-in e-mail advertising is more commonly charged on a Cost Per Action (CPA) basis.
Split into simpler sentences: This technique is applied with web banners, text links, e-mail spam, and opt-in e-mail advertising. Although opt-in e-mail advertising is more commonly charged on a Cost Per Action (CPA) basis.