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Graphics object can be combined using +.

So in your case this should work:

sage: pl = pl1 + pl2
sage: pl

Graphics object can be combined using +.

So in your case this should work:

sage: pl = pl1 + pl2
sage: pl

Edit, inspired by @Emmanuel Charpentier's comment to my initial answer.

This works too:

sage: t = SR.var('t')
sage: xys = [[sin(2*t), cos(3*t)], [sin(t), cos(t)]]
sage: sum(parametric_plot(xy, (t, 0.0, 9.0), aspect_ratio=1) for xy in xys)