Complex sentence: Aliasing can occur in optical and chemical processing, but it is more common and more easily understood in digital processing, where it occurs whenever an optical or digital image is sampled or re-sample at a rate which is too low for its resolution.
Split into simpler sentences: Aliasing can occur in optical and chemical processing, but it is more common and more easily understood in digital processing. It occurs whenever an optical or digital image is sampled or re-sampled at a rate which is too low for its resolution.