Make sure all of the commons are used correctly. If I need to add commas please show me where.And any other errors Thanks

In your letter of July 18, you made a settlement demand of $20,000; accordingly, we have forward your settlement demand, the medical reports from Doctor Hammonds, and hospital records to our client.

Our client has requested that we take the discovery deposition of the plaintiff Brenda Fletcher and her mother Dorothy Fletcher; consequently, please send us a list of dates on which you will be available to take these depositions. It is their opinion that they need this information before they can proceed to make an evaluation of this case. At the time of these depositions, we will be glad to make available any company employee or employees that you desire to impose.

It is my understanding that my associate is having some difficult obtain answer to your interrogatories. He has schedule a meeting with the supervisor and some of the employees from the Production Department to determine who did the repair worked on the defective medical emergency mailing device on the stamping machine; therefore, I see no reason not to proceed with the deposition. We will certainly get this information to you as soon as possible. If you feel these answer should precede the deposition, let me know.

Okay read through it. Where you take breaths or give pauses add your commas, where you don't I'd take them away. Where you say words that you haven't typed add them and where you don't say words, take them out of your text.

Good luck!

If you depend on your breathing to tell you where to put commas, you're both in a world of hurt!!

http://grammar.ccc.commnet.edu/grammar/commas.htm
Study the different comma uses (and when NOT to use a comma) here.

In your letter of July 18, you made a settlement demand of $20,000. Accordingly, we have forwarded your settlement demand, the medical reports from Doctor Hammonds, and hospital records to our client.

Our client has requested that we take the discovery deposition of the plaintiff, Brenda Fletcher, and her mother, Dorothy Fletcher. Consequently, please send us a list of dates on which you will be available to take these depositions. It is their opinion that they need this information before they can proceed to make an evaluation of this case. At the time of these depositions, we will be glad to make available any company employee or employees that you desire to impose.

It is my understanding that my associate is having some difficulty obtaining answers to your interrogatories. He has scheduled a meeting with the supervisor and some of the employees from the Production Department to determine who did the repair work on the defective medical emergency mailing device on the stamping machine. Therefore, I see no reason not to proceed with the deposition. We will certainly get this information to you as soon as possible. If you feel these answers should precede the deposition, let me know.

Regarding commas, I have added them in appropriate places. Please note that the use of a comma before the conjunction "and" (in the sentence about the depositions) is a matter of style preference. Some style guides recommend using a comma before the final "and" in a series, while others do not.