Complex sentence: The unreasonable ineffectiveness of mathematics is a catchphrase, alluding to the well-known article by physicist Eugene Wigner unreasonable effectiveness of mathematics in the natural sciences and implying the claim that mathematical analysis has not proved as valuable in other fields as in physics.
Split into simpler sentences: The unreasonable ineffectiveness of mathematics is a catchphrase, alluding to the well-known article by physicist Eugene Wigner, "unreasonable effectiveness of mathematics in the natural sciences". This catchphrase is meant to suggest that mathematical analysis has not proved as valuable in other fields as it has in physics.