lumpy as two-day old porridge 
(ROOT (ADJP (ADJP (JJ lumpy)) (PP (IN as) (NP (ADJP (NP (CD two) (HYPH -) (NN day)) (JJ old)) (NN porridge)))))
(ROOT (ADJP (ADJP (JJ )) (PP (IN ) (NP (ADJP (NP (CD ) (HYPH ) (NN )) (JJ )) (NN )))))