Complex sentence: The dress was rather narrow, even constricting, made of white or unbleached fabric for the lower classes, the sleeve starting under the chest in higher classes, and held up by suspenders tied onto the shoulders.
Split into simpler sentences: The dress was rather narrow and even constricting, made of white or unbleached fabric for the lower classes. Garments worn by higher classes featured sleeves starting under the chest and were held up by suspenders tied onto the shoulders.