(S (S (PP (IN In) (BASENP (NN fact))) (COMMA ,) (S (NP (BASENP (DT the) (NN leader)) (PP (IN of) (NP (BASENP (DT the) (NN team)) (PP (IN behind) (BASENP (DT this) (NN development)))))) (VP (VBD was) (NP (BASENP (NN one)) (PP (IN of) (NP (BASENP (DT the) (JJ main) (NNS critics)) (PP (IN of) (BASENP (JJR earlier) (JJ low-temperature) (NN fusion) (NNS claims))))))))) (PERIOD .))