Under Ferdinand and Isabella, Spain underwent a dramatic transformation.
( ( Under ( ( Ferdinand and ) Isabella ) ) ( , ( Spain ( ( underwent ( a ( dramatic transformation ) ) ) . ) ) ) )
(ROOT (S (PP (IN Under) (NP (NNP Ferdinand) (CC and) (NNP Isabella))) (, ,) (NP (NNP Spain)) (VP (VBD underwent) (NP (DT a) (JJ dramatic) (NN transformation))) (. .)))
Spain embarked on a long period of stagnation under Ferdinand and Isabella.
( Spain ( ( ( embarked ( on ( ( a ( long period ) ) ( of stagnation ) ) ) ) ( under ( ( Ferdinand and ) Isabella ) ) ) . ) )
(ROOT (S (NP (NNP Spain)) (VP (VBD embarked) (PP (IN on) (NP (NP (DT a) (JJ long) (NN period)) (PP (IN of) (NP (NN stagnation))))) (PP (IN under) (NP (NNP Ferdinand) (CC and) (NNP Isabella)))) (. .)))