Original sentence: The moving elements were thus relatively large and rather blocky or squarish, and their movement was constrained, but this was not visually obvious and the sight of moving full-colour graphics was hugely impressive to Spectrum owners
Edited sentence: The moving elements were thus relatively large and rather blocky or squarish, and their movement was constrained, but this was not visually obvious and the sight of moving full-colour graphics was hugely impressive to Spectrum owners, who were long used to mocking jibes from owners of machines capable of animated full-colour graphics such as the much more expensive Commodore 64