Complex sentence: The Winsupersite is a popular website by the Microsoft Windows enthusiast Paul Thurrott which mostly contains reviews about popular Microsoft software (especially software betas) such as Windows Vista, Windows Media Player 11, Internet Explorer 7 and Office 2007.
Split into simpler sentences: The Winsupersite is a popular website maintained by the Microsoft Windows enthusiast Paul Thurrott which mostly publishes reviews about Microsoft upcoming software products. Reviewed softwares includes Windows Vista, Windows Media Player 11, Internet Explorer 7 and Office 2007.