(S (S (S (BASENP (JJ Additional) (NN water)) (VP (VBD arrived) (ADVP (RB later)))) (COMMA ,) (SBAR (IN as) (S (NP (BASENP (DT the) (NN severity)) (PP (IN of) (BASENP (DT the) (NN fire)))) (VP (ADVP (RB slowly)) (VBD decreased))))) (PERIOD .))