Complex sentence: The bad character skip is only low, on a partial match, when the final character of the needle also occurs elsewhere within the needle, with 1 byte movement happening when the same byte is in both of the last two positions.
Split into simpler sentences: The bad character skip is only low, on a partial match, when the final character of the needle also occurs elsewhere within the needle. With 1 byte movement happening when the same byte is in both of the last two positions.