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(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_0 (S_1 (NP_0 (DT_1 That)) (VP_5 (VBD_1 was) (SBAR_0 (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_1 was) (PP_1 (IN_1 of) (NP_2 (NN_3 inside)))))))) (COMMA_0 ,)) (COMMA_0 ,)) (VP_3 (VBD_0 looked))) (DOT_0 .)))