Complex sentence: The output that is found in the interference pattern is not some fractional state such as perhaps classical thinking might expect; no, it is a pure state that is either detected or not detected, with a definite probability.
Split into simpler sentences: The output that is found in the interference pattern is not some partial or fractional state such as perhaps classical thinking might expect. No, it is a pure state that is either detected or not detected, with a definite probability.