( They ( ( are ( evergreen ( with ( branches ( forming ( horizontal layers ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (VP (VBN evergreen) (PP (IN with) (NP (NP (NNS branches)) (VP (VBG forming) (NP (JJ horizontal) (NNS layers))))))) (. .)))
They are evergreen with branches forming horizontal layers.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS sediments)) (VP (VB settle) (PRT (RP out)) (PP (IN of) (NP (NN water)))))) (, ,) (NP (PRP they)) (VP (VBP form) (NP (JJ horizontal) (NNS layers))) (. .)))
When sediments settle out of water, they form horizontal layers.