Complex sentence: Lowther's tragic death was also the inspiration for Carol Shields' 1987 novel "Swann"; the title of her "A Stone Diary" may also have inspired the title of Shields' "The Stone Diaries".
Split into simpler sentences: Lowther's tragic death was also the inspiration for Carol Shields' 1987 novel "Swann". The title of her "A Stone Diary" may also have inspired the title of Shields' "The Stone Diaries".