This email is hard to understand, especially the first part. I made slight adjustments as follows:
Dear Mr. …..,
The quality-control department has approved 100 grams of sodium chloride from Changzhou Pharmaceutical Factory, China, submitted through Gudia (Pvt) Limited, Karachi vide Q.C.R #7327 and Q.A.R #BS08-0100 on December 16, 2008.
You are requested to manufacture a small batch in order to conduct a stability test before we are able to import more.
Thank you for your attention to this matter.
Student or Learner