Complex sentence: Not all multiscale patterns are composed of rectangular pixels, even if they were designed using a computer, and not all pixellated patterns work at different scales, so being pixellated or digital does not of itself guarantee improved performance.
Split into simpler sentences: Not all multiscale patterns are composed of rectangular pixels, even if they were designed using a computer. Further, not all pixellated patterns work at different scales, so being pixellated or digital does not of itself guarantee improved performance.