( ( By this ) ( I ( ( mean ( that ( ( ( ( about three ) months ) ( after ( I ( transplanted ( my ( new plant ) ) ) ) ) ) ( ( a ( Drosera seedling ) ) ( sprouted ( at ( ( it 's ) base ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN By) (NP (DT this))) (NP (PRP I)) (VP (VBP mean) (SBAR (IN that) (S (SBAR (NP (QP (RB about) (CD three)) (NNS months)) (IN after) (S (NP (PRP I)) (VP (VBZ transplanted) (NP (PRP$ my) (JJ new) (NN plant))))) (NP (DT a) (NNP Drosera) (NN seedling)) (VP (VBD sprouted) (PP (IN at) (NP (NP (PRP it) (POS 's)) (NN base))))))) (. .)))
By this I mean that about three months after I transplanted my new plant a Drosera seedling sprouted at it's base.
(ROOT (S (NP (NNP New) (NNS plants)) (VP (VBP start) (S (VP (VBG sprouting) (PP (ADVP (NP (CD two) (NNS months)) (RBR later)) (IN after) (NP (DT a) (NN forest) (NN fire)))))) (. .)))