Complex sentence: The show was filmed live at Nine's GTV Richmond studios in Melbourne, the show replaced "Quizmania" and is produced entirely by the Nine Network, unlike "Quizmania" which was produced by Fremantle Media.
Split into simpler sentences: The show was filmed live at Nine's GTV Richmond studios in Melbourne. It replaced "Quizmania" and was produced entirely by the Nine Network, unlike "Quizmania" which was produced by Fremantle Media.