Question: simplifying a complex symbolic expression

Hi everyone, I want to simplify a complex symbolic expression and then separate it to the real and imaginary part in maple. The expression is as below:

Ec := (Ems+I*Eml)*(1+((Ems+I*Eml)/Ef-1)*Zeta*phi/((Ems+I*Eml)/Ef+Zeta))/(1-((Ems+I*Eml)/Ef-1)*phi/((Ems+I*Eml)/Ef+Zeta));

All the constants are positive. Can anyone help?

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