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 strong, yet brittle.
( It ( ( was ( strong ( , ( yet brittle ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (ADJP (JJ strong) (, ,) (CC yet) (JJ brittle))) (. .)))