There are two challengers to these top dogs.
( There ( ( are ( ( two challengers ) ( to ( these ( top dogs ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS challengers)) (PP (TO to) (NP (DT these) (JJ top) (NNS dogs))))) (. .)))
These top dogs face two tough financial challenges.
( ( These ( top dogs ) ) ( ( face ( two ( tough ( financial challenges ) ) ) ) . ) )
(ROOT (S (NP (DT These) (JJ top) (NNS dogs)) (VP (VBP face) (NP (CD two) (JJ tough) (JJ financial) (NNS challenges))) (. .)))