Complex sentence: MCDXLIV, MCDXLVI, MCDLXIV, MCDLXVI, MDCXLIV, MDCXLVI, MDCLXIV, MDCLXVI use each of the digits just once, while has pandigital Roman numerals with repeats.
Split into simpler sentences: MCDXLIV, MCDXLVI, MCDLXIV, MCDLXVI, MDCXLIV, MDCXLVI, MDCLXIV, MDCLXVI. These, listed in, use each of the digits just once, while has pandigital Roman numerals with repeats.