Sex goddess. Movie star. Troubled soul.Guy Rocha, retired Nevada state archivist, will talk about Marilyn Monroe's complexities and her links to Nevada in a Valentine's Day lecture at 10 a.m. Thursday at the Sierra Place senior residence.Monroe "is an American film icon who is arguably misunderstood by the general population. We know her as a sex goddess. The people who knew her most knew she was more," Rocha said, adding, "Those of us who get to know her see how complex and tortured she was."Rocha's lecture will shed light on the conflicted and complex actress who still captures our imagination. …