Complex sentence: Windows NT 4.0, a preemptive, graphical and business-oriented operating system designed to work with either uniprocessor or symmetric multi-processor computers, was part of Microsoft's Windows NT line of operating systems and was released to manufacturing on 31 July 1996.
Split into simpler sentences: Windows NT 4.0 is a preemptive, graphical and business-oriented operating system designed to work with either uniprocessor or symmetric multi-processor computers. It was part of Microsoft's Windows NT line of operating systems and was released to manufacturing on 31 July 1996.