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Your problem is that

# assume(omega, "real") # this does not work

thus prohibiting Sage to simplify expressions involving real_part, imag_part and others...

And this is attributable to

s = polygen(CC, "s")

omega = polygen(CC, "omega")

s and o no longer are symbolic expressions ; therefore, Sage can't assume anything about them.

Tell me what's wrong with the trivial solution :

s21 = 0.894292331092066/(s^4 + 2.14081977623463*s^3 + 3.15237117897600*s^2 + 2.31898630138664*s + 0.902488008823108)
var("omega", domain="real")

whose result you can meditate upon...