( ( Every year ) ( , ( ( ( a ( new layer ) ) ( of ( ( sapwood and ) phloem ) ) ) ( ( is added ) . ) ) ) )
(ROOT (S (NP (DT Every) (NN year)) (, ,) (NP (NP (DT a) (JJ new) (NN layer)) (PP (IN of) (NP (NN sapwood) (CC and) (NN phloem)))) (VP (VBZ is) (VP (VBN added))) (. .)))
Every year, a new layer of sapwood and phloem is added.
(ROOT (S (NP (NP (DT The) (JJS newest)) (, ,) (NP (NP (JJ outer) (NNS layers)) (PP (IN of) (NP (JJ secondary) (NN xylem))))) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ sapwood))))) (. .)))