Complex sentence: The fact is that the life and career of this beautiful and enigmatic actress has always been involved by mysterious facts and speculations and probably many titles may exist with her in the cast not listed on the IMDB.
Split into simpler sentences: The fact is that the life and career of this beautiful and enigmatic actress has always been characterised by mysterious facts and speculations. There are probably many titles may exist with her in the cast, that are not listed on the IMDB.