( There ( ( must ( be ( shelters ( that ( are ( willing ( to ( ( accept ( the animals ) ) ( that ( ( some shelters ) ( will not ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (MD must) (VP (VB be) (NP (NP (NNS shelters)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ willing) (S (VP (TO to) (VP (VB accept) (NP (DT the) (NNS animals)) (SBAR (IN that) (S (NP (DT some) (NNS shelters)) (VP (MD will) (RB not)))))))))))))) (. .)))
There must be shelters that are willing to accept the animals that some shelters will not.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP it)) (VP (VBZ rains)))) (, ,) (NP (DT some) (NNS animals)) (VP (MD will) (VP (VB move) (S (VP (TO to) (VP (VB seek) (NP (NN shelter))))))) (. .)))