(S (S (NP (BASENP (DT The) (NN cartel)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VBD created) (BASENP (ADJP (RB artificially) (JJ high)) (NNS prices))) (PP (IN by) (S (VP (VBG eliminating) (NP (BASENP (NN competition)) (PP (IN between) (BASENP (PRPD its) (NNS members)))))))))) (COMMA ,))) (VP (VBD was) (VP (VBN exposed) (PP (IN by) (NP (BASENP (NN whistleblower) (NNP Lufthansa)) (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VP (VBD alerted) (BASENP (NNS authorities))) (PP (IN in) (NP (BASENP (NN exchange)) (PP (IN for) (NP (BASENP (NN immunity)) (PP (TO to) (BASENP (NN prosecution))))))))))))))) (PERIOD .))