( ( When ( winter ( hits ( the north ) ) ) ) ( , ( ( many birds ) ( ( ( ( fly ( far south ) ) ( to ( ( the warmth ) ( of ( the tropics ) ) ) ) ) ( where ( food ( is ( more plentiful ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN winter)) (VP (VBZ hits) (NP (DT the) (NN north))))) (, ,) (NP (JJ many) (NNS birds)) (VP (VBP fly) (ADVP (RB far) (RB south)) (PP (TO to) (NP (NP (DT the) (NN warmth)) (PP (IN of) (NP (DT the) (NNS tropics))))) (SBAR (WHADVP (WRB where)) (S (NP (NN food)) (VP (VBZ is) (ADJP (RBR more) (JJ plentiful)))))) (. .)))
When winter hits the north, many birds fly far south to the warmth of the tropics where food is more plentiful.
(ROOT (S (NP (NP (JJ Many) (NNS species)) (PP (IN of) (NP (NP (NNS birds)) (PP (IN in) (NP (JJ new) (NN england)))))) (VP (VBP fly) (ADVP (RB south) (PP (IN for) (NP (DT the) (NN winter) (NNS months)))) (S (VP (TO to) (VP (VB find) (NP (DT an) (NN environment)) (PP (IN with) (NP (JJR more) (NN food))))))) (. .)))