I'm in the process of a derivative and I'm having trouble simplifying. Would someone mind helping me out with where to start.

Here is the original problem I was told to differentiate:

I decided to use the quotient rule and came up with this as the first step:

and then this:

and here is what I multiplied it all out to:

Now, its been a while and my algebra is rusty so I'm stuck here. What is the first thing you would do to go about simplifying? Thanks in advance.