(S (S (S (PP (VBN Forced) (VP (TO to) (VP (VP (VB retire) (ADVP (RB early))) (PP (IN from) (NP (BASENP (JJ competitive) (NN sport)) (PP (IN due) (PP (TO to) (BASENP (JJ multiple) (NN sclerosis)))))))))) (COMMA ,) (S (BASENP (NNP Heuga)) (VP (VP (VBD continued) (PP (TO to) (BASENP (NN train)))) (PP (IN as) (BASENP (DT an) (NN athlete)))))) (PERIOD .))