(S (S (S (BASENP (DT The) (NN migration)) (VP (VP (VBD was) (ADVP (RB originally))) (ADJP (JJ due) (S (VP (TO to) (VP (VB start) (BASENP (DT this) (NN year)))))))) (COMMA ,) (SBAR (BASENP (NN three) (NNS years)) (SBAR (IN after) (S (NP (BASENP (DT the) (NN decision)) (S (VP (TO to) (VP (VB migrate) (PP (TO to) (BASENP (NNP Linux))))))) (VP (VBD was) (VP (VBN made))))))) (PERIOD .))