Complex sentence: The normalized sinc function is the Fourier transform of the rectangular function with no scaling and its function is fundamental in the concept of reconstructing the original continuous bandlimited signal from uniformly spaced samples of that signal.
Split into simpler sentences: The normalized sinc function is the Fourier transform of the rectangular function with no scaling. This function is fundamental in the concept of reconstructing the original continuous bandlimited signal from uniformly spaced samples of that signal.