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In order to fix the 2 hole wall mounted mixer supplied, we require a pre-fabricated rough parts connected to the built-in part; otherwise, the plumber has to make a copper plumbing connection between the control valve and the spout. The supplier sent a spout and control with individual built-in part and there is no connection between them.
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A little confusing. I think this is what you want to say:

You have supplied us with a two-hole, wall-mounted mixer, but as it stands there is nothing to connect the spout and the built-in control valve. What we need is a pre-fabricated rough connection to the control valve, otherwise the plumber will have to construct copper tubing to connect the control valve and the spout. Please send this missing part at once.