The stuff was strong, but somewhat brittle.
( ( The stuff ) ( ( was ( ( ( strong , ) but ) ( somewhat brittle ) ) ) . ) )
(ROOT (S (NP (DT The) (NN stuff)) (VP (VBD was) (ADJP (ADJP (JJ strong)) (, ,) (CC but) (ADJP (RB somewhat) (JJ brittle)))) (. .)))
It was incredibly strong and not brittle at all.
( It ( ( was ( ( ( ( incredibly strong ) and ) ( not brittle ) ) ( at all ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (ADJP (ADJP (RB incredibly) (JJ strong)) (CC and) (ADJP (RB not) (JJ brittle)) (ADVP (IN at) (DT all)))) (. .)))