( Basically ( , ( macroevolution ( ( ( ( is ( about ( big ( evolutionary changes ) ) ) ) , ) ( over ( ( ( long ( time periods ) ) , ) ( while ( microevolution ( is ( about ( ( smaller ( , more ) ) ( rapid changes ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Basically)) (, ,) (NP (NN macroevolution)) (VP (VBZ is) (PP (IN about) (NP (JJ big) (JJ evolutionary) (NNS changes))) (, ,) (PP (IN over) (NP (NP (JJ long) (NN time) (NNS periods)) (, ,) (SBAR (IN while) (S (NP (NN microevolution)) (VP (VBZ is) (PP (IN about) (NP (ADJP (JJR smaller) (, ,) (JJR more)) (JJ rapid) (NNS changes))))))))) (. .)))
Basically, macroevolution is about big evolutionary changes, over long time periods, while microevolution is about smaller, more rapid changes.
(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))))))))) (. .)))