Complex sentence: The company's flagship product that uses g-speak is a conference room collaboration system, called Mezzanine, and is a superset of telepresence, webconferencing, videoconferencing, and teleconferencing systems.
Split into simpler sentences: The company's flagship product is a conference room collaboration system called Mezzanine. It uses g-speak and is a superset of telepresence, webconferencing, videoconferencing, and teleconferencing systems.