Complex sentence: In 1677,17 months after the death of his first wife, Wren remarried, this time to Jane Fitzwilliam, daughter of William FitzWilliam, 2nd Baron FitzWilliam and his wife Jane Perry, the daughter of a prosperous London merchant.
Split into simpler sentences: In 1677,17 months after the death of his first wife, Wren married once again. He married Jane Fitzwilliam, daughter of William FitzWilliam, 2nd Baron FitzWilliam and his wife Jane Perry, the daughter of a prosperous London merchant.