( This ( ( is ( ( a type ) ( of ( relationships ( that ( is ( very ( beneficial ( for ( the environment ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NP (NNS relationships)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (RB very) (JJ beneficial) (PP (IN for) (NP (DT the) (NN environment))))))))))) (. .)))
This is a type of relationships that is very beneficial for the environment.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN beneficial) (NN relationship)) (VP (VBZ exists) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT a) (JJ certain) (NN type)) (PP (IN of) (NP (NP (NN tree) (POS 's)) (NNS roots)))) (VP (VBP need) (S (NP (DT a) (NN fungus)) (VP (VB present) (SBAR (IN in) (NN order) (S (VP (TO to) (VP (VB grow) (ADVP (RB normally)))))))))))) (. .)))
A(n) beneficial relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally.