while a thunder n<apostrophe>t of He slithered over to , Another valley was .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (SBAR_0 (IN_2 while) (S_1 (NP_0 (NP_5 (DT_0 a) (NN_2 thunder)) (PP_0 (ATPP_0 (RB_1 n<apostrophe>t) (IN_1 of)) (NP_1 (PRP_0 He)))) (VP_5 (ATVP_3 (VBD_2 slithered) (PRT_0 (RP_0 over))) (S_2 (TO_0 to))))) (COMMA_0 ,)) (NP_0 (DT_1 Another) (NN_2 valley))) (VP_3 (VBD_0 was))) (DOT_0 .)))