(S (S (NP (BASENP (NN Work)) (PP (IN at) (NP (BASENP (DT a) (NNP Robben) (NNP Island) (NN limestone) (NN quarry)) (PRN (COMMA ,) (SBAR (WHADVP (WRB where)) (S (BASENP (PRP he)) (VP (VBD was) (VP (VP (VBN imprisoned) (PP (IN for) (BASENP (NN sixteen) (NNS years)))) (PP (IN during) (NP (BASENP (NNP South) (NNP Africa) (POS 's)) (BASENP (NNP Apartheid)))))))) (COMMA ,))))) (VP (VBD damaged) (BASENP (PRPD his) (NNS eyes) (CC and) (NNS lungs)))) (PERIOD .))