Complex sentence: Flanner had first came to the attention of editor Harold Ross through his first wife, Jane Grant, who was a friend of Flanner's from the Lucy Stone League, an organization that fought for women to preserve their maiden names after marriage.
Split into simpler sentences: Flanner had first came to the attention of editor Harold Ross through his first wife, Jane Grant, who was a friend of Flanner's from the Lucy Stone League. The Lucy Stone League was an organization that fought for women to preserve their maiden names after marriage.