( Macroevolution ( ( ( is simply ) ( microevolution ( extrapolated ( over ( ( longer periods ) ( of time ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Macroevolution)) (VP (VBZ is) (ADVP (RB simply)) (NP (NP (NN microevolution)) (VP (VBN extrapolated) (PP (IN over) (NP (NP (JJR longer) (NNS periods)) (PP (IN of) (NP (NN time)))))))) (. .)))
Macroevolution is simply microevolution extrapolated over longer periods of time.
(ROOT (S (NP (NNP Macroevolution)) (VP (VBZ happens) (SBAR (WHADVP (WRB when)) (S (NP (NP (NNS forces)) (PP (IN of) (NP (NN evolution)))) (VP (VBP work) (PP (IN over) (NP (NP (DT a) (JJ long) (NN period)) (PP (IN of) (NP (NN time))))))))) (. .)))