Complex sentence: In fact, he contributed to the global information network before it was called the Internet, before Al Gore claimed to invent it, and before dial-up was considered obsolete... dial-up internetwork and mail exchange links, that is.
Split into simpler sentences: In fact, he contributed to the global information network before it was called the Internet, before Al Gore claimed to invent it, and before dial-up was considered obsolete. Dial-up internetwork and mail exchange links, that is.