(S (S (BASENP (DT The) (NN ship) (NNP Runner) (NNP 4)) (VP (VBD sank) (PP (JJ due) (PP (TO to) (NP (BASENP (DT a) (NN collision)) (PP (IN with) (NP (BASENP (DT another) (NN ship)) (COMMA ,) (PP (IN in) (NP (BASENP (DT a) (NN convoy)) (PP (VBG following) (BASENP (DT a) (JJ Russian) (NN icebreaker)))))))))))) (PERIOD .))