please help me with my personal statment^^

Dear all,

I'm trying to finsish up my statement of purpose for my graduate school but I'm not sure if I have a right grammer and clear meaning below following sentence. Any comment would be help me alots....

Thanks you and Have a great day!!!

"Even the request of non-degree student in food science to proof that my poor performance in chemistry was caused from my academic motivation, not my talent, also did not allow by the committee since they have not done it before and they were cautious about doing it."