Can somebody can help me? This is my homework.

The purpose of this e-mail is to notice inform you about a big significant problem at their the Stuttgart Office between the head of the office, Sam Benetti, and the business manager, Max Davis. They were not working productively together not get on with each together. Is untenable, because of this I decided to make a meeting with the other Director of the company to solve the situation. As this situation was untenable, I decided to organize a meeting with the director of the company to resolve the issue.

Following a meeting on Thursday, (month) 1st, we decided the best solution would be to send Mr. Benetti and Mr. Davis to do a Lidership Leadership Course and a Team Working Course. We consider they are helpful for them to be assets (helpful) to the company and these types of courses will help they them to prioritize maintain their work tasks and personal affairs separate.

We would be grateful if you could attend to this matter as soon as possible because Mr. Davis Max threatened to resign if in the company continued keeps Mr. Benetti.

We appreciate your time.
Yours faithfully (Consider something like "Sincerely," or "Best Wishes")

Notes

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1) I changed "big" to "significant" since "big" sounds unprofessional to me here.

2) At first I misunderstood the sequence of events so I made some corrections to the verb tenses in the first paragraph.  Since you say in the second paragraph that a meeting about this conflict has already happened, it seems more natural to me to put the first paragraph in the past tense.

3) You should write the name of the month with the date.  For instance, Thursday, June 1st.  They should be separated by a comma.

4)  Are these the actual names of the course?  That is, is there a course called Leadership Course that these men are going to take?  If you are just talking about leadership courses in general, then you would not capitalize it.

Espero que mis correcciones te ayuden y que tengan sentido!  No dudes en preguntarme si quieres que te las explique mejor.