What would you like? A factored form? I'm guessing factor, since that is what you can do:
To begin, we can use the RRT (rational root theorem) to get a root: https://en.wikipedia.org/wiki/Rational_root_theorem
We see that 1 is the only possible root.
From here, we see that one factor is (x - 1)
Divide x^3 + 4x - 5 by x - 1.
x^2 + x + 5
-----------------------------------
x - 1 | x^3 + 4x - 5
Therefore, the factored form is (x - 1)(x^2 + x + 5)
:)