's a lot richer than the ones 
(ROOT (VP (VBZ 's) (ADJP (ADJP (NP (DT a) (NN lot)) (JJR richer)) (PP (IN than) (NP (DT the) (NNS ones))))))
(ROOT (VP (VBZ ) (ADJP (ADJP (NP (DT ) (NN )) (JJR )) (PP (IN ) (NP (DT ) (NNS ))))))