finding an interesting shell on the beach ( Looks like Mom's shiny necklace. 
( ( ( finding ( an ( interesting shell ) ) ) ( on ( ( the beach ) ( -LRB- ( Looks ( like ( ( Mom 's ) ( shiny necklace ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VBG finding) (NP (DT an) (JJ interesting) (NN shell)) (PP (IN on) (NP (NP (DT the) (NN beach)) (SBAR (S (-LRB- -LRB-) (NP (NNP Looks)) (VP (VBP like) (NP (NP (NN Mom) (POS 's)) (JJ shiny) (NN necklace)))))))) (. .)))
That shell looks like Mom's necklace.
( ( That shell ) ( ( looks ( like ( ( Mom 's ) necklace ) ) ) . ) )
(ROOT (S (NP (DT That) (NN shell)) (VP (VBZ looks) (PP (IN like) (NP (NP (NN Mom) (POS 's)) (NN necklace)))) (. .)))