Answer:
I am sorry, but this is as far as it can get with the simplification (in my opinion).
I tried to use a's, b's, and c's, but it took me no where. I then tried partial fractions, it took me close but no where near the constant numbers you have.
I am sorry, I could not help, but I suggest that you try partial fractions (in case I went wrong somewhere).
Explanation: