( This ( ( creates ( ( a bulge ) ( called ( a ( groin hernia ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ creates) (SBAR (S (NP (DT a) (NN bulge)) (VP (VBD called) (NP (DT a) (NN groin) (NN hernia)))))) (. .)))
This creates a bulge called a groin hernia.
(ROOT (S (NP (NP (DT A) (NN wall)) (PP (IN of) (NP (NP (NNS rocks)) (CC or) (NP (JJ concrete) (DT a))))) (VP (VBD called) (NP (DT a) (NN groin))) (. .)))