comparison of a cluase with a sentence

[sanjay puranik]

I am a structural engineer by profession. The other day I received an e-mail from colleague at a job site which went thus.

" we are now ready to erect equipment v-67.
Attached please find pictures of the temporary structures requied for the erection. YOU WILL NOTICE IN PICTURE 1 THAT THE LUG PLATES HAVE BEEN WELDED TO THE TIE BEAM WHICH IS PREFERABLE TO WELDING THEM TO THE FLANGES"
"YOU WILL NOTICE.......BEEN WELDED" is a complete sentence whereas "WICH IS PREFERABLE ...... FLANGES" is not. Is it OK to link the two the way it was done by my colleague?

 

[David L.]

Yes.
What was it about the sentence that raised a doubt?
How did you think he should have written those sentences? Could you post them so we can discuss them?