(S (S (S (BASENP (NN Damage)) (VP (VBD was) (VP (VBN done) (PP (TO to) (BASENP (DT the) (NN roof)))))) (SBAR (IN as) (S (BASENP (NN debris)) (VP (VBD fell) (PP (TO to) (BASENP (DT the) (NN floor))))))) (PERIOD .))