( ( Some ( animal shelters ) ) ( ( are ( run ( by ( Humane Societies ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (NN animal) (NNS shelters)) (VP (VBP are) (VP (VBN run) (PP (IN by) (NP (NNP Humane) (NNPS Societies))))) (. .)))
Some animal shelters are run by Humane Societies.
(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))))))) (. .)))