Complex sentence: Francis' sister and cousin to Ross, described as plain, with fluffy hair and a mobile mouth, she is a dutiful unmarried daughter, looking after the affairs of the estate, as well as her father, Charles Poldark.
Split into simpler sentences: Francis' sister and cousin to Ross is described as plain, with fluffy hair and a mobile mouth. She is a dutiful unmarried daughter who looks after the affairs of the estate, as well as her father, Charles Poldark.