Please see Annex 1 and 2 for case studies on our existing clients within the healthcare sector which shows how we have successfully implemented recycling procedures which has reduced overall waste volumes and increased recycling rates.
What is the name for the grammar error in this sentence? It doesn't sound right.
The errors are that "shows" does not agree in number with "case studies", "has" does not agree in number with "procedures", and "Annex 1 and 2" should be "Annex 1 and Annex 2" or "Annexes 1 and 2". The nested "which ... " structure may be seen as stylistically slightly awkward, but it is not actually incorrect English.
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The errors are that "shows" does not agree in number with "case studies", "has" does not agree in number with "procedures", and "Annex 1 and 2" should be "Annex 1 and Annex 2" or "Annexes 1 and 2".
The nested "which ... which ..." structure may be seen as stylistically slightly awkward, but it is not actually incorrect English.