Complex sentence: The most frequent disguise was a Quaker woman's attire; its high collar, long sleeves, gloves, veil, and a large, wide-brimmed hat could completely hide its wearer when their head was tilted slightly downward.
Split into simpler sentences: The most frequent disguise was a Quaker woman's attire. Its high collar, long sleeves, gloves, veil, and a large, wide-brimmed hat could completely hide its wearer when their head was tilted slightly downward.