How has the law helped human workers?
If I answer this question, which of the following is suitable?
1.The law has helped human worker by limiting the numbers of working hours.
2.The law has helped human workers limit the numbers of working hours.
'... has helped ... ' If you use the example in (2) it suggests the workers have carried out the action of limiting working hours and the law has assisted them.
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'... has helped ... by limiting ...'
If you use the example in (2) it suggests the workers have carried out the action of limiting working hours and the law has assisted them. This, presumably, is not the exact meaning you want.
I would say:
The law has helped workers by limiting the number of working hours.'
'Human' seems superfluous and I've adjusted the plurals slig