( But ( ( when ( rain falls ) ) ( they ( clearly ( ( ( can not ) ( seek shelter ) ) . ) ) ) ) )
(ROOT (S (CC But) (SBAR (WHADVP (WRB when)) (S (NP (NN rain)) (VP (VBZ falls)))) (NP (PRP they)) (ADVP (RB clearly)) (VP (MD can) (RB not) (VP (VB seek) (NP (NN shelter)))) (. .)))
But when rain falls they clearly cannot seek shelter.
(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))))))) (. .)))