(S (S (PP (IN As) (NP (BASENP (DT a) (NN result)) (PP (IN in) (BASENP (DT the) (JJ middle-end) (NN section))))) (COMMA ,) (S (BASENP (DT the) (JJ main) (NN group) (NN extremity)) (VP (VBD controlled) (NP (BASENP (DT the) (NN condition)) (PP (IN of) (BASENP (DT this) (NN race))))))) (PERIOD .))