He sat for a moment in silence.
( He ( ( ( sat ( for ( a moment ) ) ) ( in silence ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD sat) (PP (IN for) (NP (DT a) (NN moment))) (PP (IN in) (NP (NN silence)))) (. .)))
Standing, he let out a harsh yell. 
( Standing ( , ( he ( ( ( let out ) ( a ( harsh yell ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Standing))) (, ,) (NP (PRP he)) (VP (VBP let) (PRT (RP out)) (NP (DT a) (JJ harsh) (NN yell))) (. .)))