The statement that is fair, focused, and complex is:
"A research psychologist recently published a case study showing that natural talent combined with consistent effort produces measurably higher success rates."
This statement is fair because it presents evidence from a credible source (a research psychologist) and acknowledges that both natural talent and consistent effort are important. It is focused on the relationship between talent, effort, and success, and it is complex because it recognizes that the interaction between these factors may influence outcomes in a nuanced way.