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Please arrange for the assistance for site survey by the sub-contractor to prepare the quotation for gypsum work.

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I don't understand what you wrote. Who is helping who, to do what?

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Thank you for your kind help. Please look at the below sentences and help me to correct

Please arrange a site assistance for the site survey by our sub-contractor for preparing a quotation for the gypsum work to be carried out in the above project.

Shouldn't it be "who is helping whom"?