Complex sentence: Grokster, along with Morpheus and Kazaa, are considered second-generation peer-to-peer file sharing programs because unlike their predecessor Napster these file sharing programs allowed users to trade files directly between one another without these transactions passing through a centralized server.
Split into simpler sentences: Grokster, along with Morpheus and Kazaa, are considered second-generation peer-to-peer file sharing programs. Unlike their predecessor Napster, these file sharing programs allowed users to trade files directly between one another, without these transactions passing through a centralized server.