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 as it acknowledges the role of both natural talent and hard work, thus avoiding an overly simplistic or biased view. It is focused on a specific study and its findings, and it presents a complex argument by considering the interplay between talent and effort rather than favoring one over the other.