Complex sentence: Microsoft plans to include Windows CardSpace within its impending new Operating System Windows Vista, and is also available as part of Microsoft's.NET Framework 3.0 for Windows XP and Windows Server 2003.
Split into simpler sentences: Microsoft plans to include Windows CardSpace within its impending new Operating System Windows Vista. It will also be available as part of Microsoft's upcoming.NET Framework 3.0 for Windows XP and Windows Server 2003.