mathematical physics – How to seperate the real part and imaginary part from a complex expression

I need to saperate the real part and the imaginary part from the following expression.

     Csc(2 (Theta)12)^3 (-32 E^(4 I (Delta))
        Cos((Theta)23)^3 Cos(
        2 (Theta)23) (Cos((Delta)) Cos((Theta)13)^2 + 
         I Sin((Delta))) Sin(
        2 (Theta)12) (E^(I (Delta))
           Cos((Theta)23) Sin(2 (Theta)12)^2 + 
         2 Sin(4 (Theta)12) Sin((Theta)13) Sin((Theta)23)) 
(PlusMinus) 
      I E^(2 I (Delta))
        Cos((Theta)23) (Cos((Theta)23) Sin(2 (Theta)12)^2 + 
         E^(-I (Delta))
           Sin(4 (Theta)12) Sin((Theta)13) Sin((Theta)23)) ((1 - 
            3 E^(2 I (Delta))) Cos(2 (Theta)23) + 
         32 E^(3 I (Delta))
           Cos((Theta)23)^3 (E^(I (Delta))
              Cos((Theta)23) Sin(2 (Theta)12)^2 + 
            2 Sin(4 (Theta)12) Sin((Theta)13) Sin((Theta)23)) + (1 
+ E^(2 I (Delta))) (-1 + 
            2 Cos(2 (Theta)23) Sin((Theta)23)^2))) 
Sec((Theta)23)^6)/(64 (E^(I (Delta)) Sin((Theta)12) + 
      Cos((Theta)12) Sin((Theta)13) Tan((Theta)23))^2 (E^(
      I (Delta)) + 
      4 Cot(2 (Theta)12) Sin((Theta)13) Tan((Theta)23)));```
On doing ```ComplexExpand(Expr1)`` I am not getting the correct expression. Please help me out.