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# Simplification of a long expression

How can I simplify an expression like this

((-1)^(1/3) (-3 I + Sqrt[

3]) (8 k Σs0 (css^2 k -

2 G π Σs0) Uϕ0[

R] (4 Ωpn +

R Derivative[1][Ωpn][R]) +

R (k^2 (css^2 k -

2 G π Σs0) (4 G π Σs0

(p0 + (-5 U0 + Π0) Σs0) +

2 css^2 k (p0 + (U0 + Π0) Σs0) +

R^2 Σs0 (css^2 k -

6 G π Σs0) Ωpn^2) +

2 Σs0 (4 k (css^2 k -

2 G π Σs0) Derivative[1][Uϕ0][

R] (4 Ωpn +

R Derivative[1][Ωpn][R]) -

2 k R (css^2 k -

2 G π Σs0) Ωpn

Derivative[1][U0][

R] (6 Ωpn +

R Derivative[1][Ωpn][R]) +

c^2 (css^2 k^2 - 2 G k π Σs0 +

4 Ωpn^2 +

2 R Ωpn Derivative[1][Ωpn][

R])^(3/2)))))/(4 Sqrt[3] c^2 R Σs0 Sqrt[

css^2 k^2 - 2 G k π Σs0 +

4 Ωpn^2 +

2 R Ωpn Derivative[1][Ωpn][R]])

I know that it should have a simple form, maybe like

css^2 k^2 - 2 G k π Σs0 + 4 Ωpn^2 + 2 R Ωpn Derivative[1][Ωpn][R]

but I can't get anything like that form Simplify or FullSimplify.