In a moment or two he was back. 
( ( In ( ( ( a moment ) or ) two ) ) ( he ( ( was back ) . ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT a) (NN moment)) (CC or) (NP (CD two)))) (NP (PRP he)) (VP (VBD was) (ADVP (RB back))) (. .)))
He went back in just a few moments. 
( He ( ( ( went back ) ( in ( ( just ( a few ) ) moments ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD went) (ADVP (RB back)) (PP (IN in) (NP (QP (RB just) (DT a) (JJ few)) (NNS moments)))) (. .)))