The grocer P : did not listen to the protests of customer Q : who was in the habit of weighing less R : whom he had cheated S : with great audacity The Proper sequence should be:

Q-P-R-S creates: 'The grocer who was in the habit of weighing less did not listen to the protests of customer whom he had cheated with great audacity.' This arrangement is coherent - 'who was in the habit of weighing less' describes the grocer, the main clause is 'did not listen', and 'whom he had cheated' identifies the customer, with 'with great audacity' describing how the grocer acted.