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Use z.simplify_rectform(None).factor():

sage: a, b = var('a b', domain='real')
sage: z = 1/(a + I*b)
sage: z.simplify_rectform(None)
a/(a^2 + b^2) - I*b/(a^2 + b^2)
sage: z.simplify_rectform(None).factor()
(a - I*b)/(a^2 + b^2)

Note that z.simplify_rectform(None) is a shortcut for z.simplify_rectform(complexity_measure=None). Type z.simplify_rectform? for more details.