Complex sentence: Philosopher Bryan Magee writes that Popper's criticisms of logical positivism were "devastating", especially his argument that, while logical positivism claimed to be a scientific theory of the world, its central tenet, the verification principle, effectively destroyed all of science.
Split into simpler sentences: Philosopher Bryan Magee writes that Popper's criticisms of logical positivism were "devastating". In Magee's view, Popper's most important argument against logical positivism is that, while it claimed to be a scientific theory of the world, its central tenet, the verification principle, effectively destroyed all of science.