The  rock  has a soft texture and can be bought in a variety of shapes.
( ( The rock ) ( ( ( ( has ( a ( soft texture ) ) ) and ) ( can ( be ( bought ( in ( ( a variety ) ( of shapes ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN rock)) (VP (VP (VBZ has) (NP (DT a) (JJ soft) (NN texture))) (CC and) (VP (MD can) (VP (VB be) (VP (VBN bought) (PP (IN in) (NP (NP (DT a) (NN variety)) (PP (IN of) (NP (NNS shapes))))))))) (. .)))
The rock is harder than most types of rock.
( ( The rock ) ( ( is ( harder ( than ( ( most types ) ( of rock ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN rock)) (VP (VBZ is) (ADJP (ADJP (JJR harder)) (PP (IN than) (NP (NP (JJS most) (NNS types)) (PP (IN of) (NP (NN rock))))))) (. .)))