Complex sentence: Brokered infomercial programs promote products or services by scripting news-style shows that may even include calls from listeners (or supposed listeners), but focus on a topic related to the product and repeatedly steer listeners or callers to a particular vendor.
Split into simpler sentences: Brokered infomercial programs promote products or services by scripting news-style shows that may even include calls from listeners (or supposed listeners). The programs focus on a topic related to the product and repeatedly steer listeners and "callers" to a particular vendor.