We had a great big book of Grimm's Fairytales, and looking back on that they were grim!
( ( ( ( ( We ( had ( ( a ( great ( big book ) ) ) ( of ( ( Grimm 's ) Fairytales ) ) ) ) ) , ) and ) ( ( looking back ) ( on ( that ( they ( were grim ) ) ) ) ) ) ! )
(ROOT (S (S (NP (PRP We)) (VP (VBD had) (NP (NP (DT a) (JJ great) (JJ big) (NN book)) (PP (IN of) (NP (NP (NNP Grimm) (POS 's)) (NNS Fairytales)))))) (, ,) (CC and) (S (VP (VBG looking) (PRT (RP back)) (PP (IN on) (SBAR (IN that) (S (NP (PRP they)) (VP (VBD were) (ADJP (JJ grim)))))))) (. !)))
We owned a huge book of Grimm's Fairytales and reminiscing, they were in fact fairly grim! 
( ( We ( ( ( owned ( ( a ( huge book ) ) ( of ( ( Grimm 's ) Fairytales ) ) ) ) and ) reminiscing ) ) ( , ( they ( ( ( were ( in fact ) ) ( fairly grim ) ) ! ) ) ) )
(ROOT (S (S (NP (PRP We)) (VP (VP (VBN owned) (NP (NP (DT a) (JJ huge) (NN book)) (PP (IN of) (NP (NP (NNP Grimm) (POS 's)) (NNS Fairytales))))) (CC and) (VP (VBG reminiscing)))) (, ,) (NP (PRP they)) (VP (VBD were) (PP (IN in) (NP (NN fact))) (ADJP (RB fairly) (JJ grim))) (. !)))