As Jon looked at him, Barnam puffed out his chest.
( ( As ( Jon ( looked ( at him ) ) ) ) ( , ( Barnam ( ( ( puffed out ) ( his chest ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (NNP Jon)) (VP (VBD looked) (PP (IN at) (NP (PRP him)))))) (, ,) (NP (NNP Barnam)) (VP (VBD puffed) (PRT (RP out)) (NP (PRP$ his) (NN chest))) (. .)))
Barnam puffed out his chest when Jon looked at him.
( Barnam ( ( ( ( puffed out ) ( his chest ) ) ( when ( Jon ( looked ( at him ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Barnam)) (VP (VBD puffed) (PRT (RP out)) (NP (PRP$ his) (NN chest)) (SBAR (WHADVP (WRB when)) (S (NP (NNP Jon)) (VP (VBD looked) (PP (IN at) (NP (PRP him))))))) (. .)))