The Kal whistled and Vrenna's eyes sparkled when she saw Jon swing it.
( ( ( The ( Kal ( whistled ( and ( Vrenna 's ) ) ) ) ) eyes ) ( ( sparkled ( when ( she ( saw ( Jon ( swing it ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNP Kal) (NNP whistled) (CC and) (NNP Vrenna) (POS 's)) (NNS eyes)) (VP (VBD sparkled) (SBAR (WHADVP (WRB when)) (S (NP (PRP she)) (VP (VBD saw) (SBAR (S (NP (NNP Jon)) (VP (VBP swing) (NP (PRP it))))))))) (. .)))
Jon is on a baseball field.
( Jon ( ( is ( on ( a ( baseball field ) ) ) ) . ) )
(ROOT (S (NP (NNP Jon)) (VP (VBZ is) (PP (IN on) (NP (DT a) (NN baseball) (NN field)))) (. .)))