Original sentence: Edward, who had appeared to go along with the wishes of his mentor, then alienated Warwick by secretly marrying a widow, Elizabeth Woodville (possibly having previously married another widow, Lady Eleanor Talbot, even more secretly)
Edited sentence: Edward, who had appeared to go along with the wishes of his mentor, then alienated Warwick by secretly marrying a widow, Elizabeth Woodville (having previously married the widow Lady Eleanor Talbot even more secretly)