(S (S (S (NP (QP (ADVP (IN At) (JJS least)) (NN 400)) (NNS homes)) (VP (VBP have) (VP (VBN been) (VP (VBN evacuated) (PP (IN in) (NP (BASENP (NNP Sierra) (NNP Madre)) (PP (IN near) (NP (BASENP (NNP Los) (NNP Angeles)) (COMMA ,) (BASENP (NNP California)))))))))) (SBAR (IN after) (S (NP (BASENP (DT a) (NN wildfire)) (SBAR (WHNP (WDT which)) (S (VP (VBD started) (PP (IN on) (BASENP (NNP Saturday))))))) (COMMA ,) (VP (VBD began) (S (VP (TO to) (VP (VB threaten) (BASENP (PRPD their) (NNS homes))))))))) (PERIOD .))