(S (S (BASENP (DT The) (NN race)) (VP (VBD started) (PP (IN behind) (NP (BASENP (DT the) (NN safety) (NN car)) (SBAR (WHNP (WDT which)) (S (VP (VP (VBD stayed) (PP (IN on) (BASENP (DT a) (NN track)))) (PP (IN for) (NP (BASENP (DT an) (ADJP (RB unusually) (JJ long)) (NN time)) (COMMA ,) (BASENP (QP (RB about) (NN 40)) (NNS minutes))))))))))) (PERIOD .))