(S (S (PP-SBJ (BASENP (NN 彼女)) (IN は)) (VP (PP (BASENP (NN １３) (NN 歳)) (IN で)) (VP (PP-OBJ (NP (PP (BASENP (DT この) (NN 旅)) (IN の)) (NN 準備)) (IN を)) (VP (VP (NN 開始) (VBV し)) (VP (MD た)))))) (PERIOD 。))
彼女 は 13 歳 で この 旅 の 準備 を 開始 し た 。
She had begun preparing for this journey at the age of thirteen .