( ( A ( transform boundary ) ) ( ( is ( where ( ( two plates ) ( ( slide along ) ( each other ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ transform) (NN boundary)) (VP (VBZ is) (SBAR (WHADVP (WRB where)) (S (NP (CD two) (NNS plates)) (VP (VB slide) (PRT (RP along)) (NP (DT each) (JJ other)))))) (. .)))
A transform boundary is where two plates slide along each other.
(ROOT (S (NP (DT A) (JJ convergent) (NN plate) (NN boundary)) (VP (VBZ is) (VP (VBN created) (SBAR (WHADVP (WRB when)) (S (NP (CD two) (NNS plates)) (VP (VBP come) (PP (IN toward) (NP (DT each) (JJ other)))))))) (. .)))