Complex sentence: The Woolsack is a large, wool-stuffed cushion or seat covered with red cloth; it has neither a back nor arms, though in the centre of the Woolsack there is a back-rest.
Split into simpler sentences: The Woolsack is a large, wool-stuffed cushion or seat covered with red cloth; it has neither a back nor arms. Though in the centre of the woolsack, there is a back-rest.