(S (S (BASENP (NNP Simon)) (VP (VBZ explains) (SBAR (IN that) (S (BASENP (PRPD his) (NN behavior)) (VP (MD may) (VP (VB have) (VP (VBN been) (VP (VBN influenced) (PP (IN by) (NP (BASENP (DT a) (NN hit)) (SBAR (S (BASENP (PRP he)) (VP (VBD received) (PP (NP (QP (ADVP (RBR less) (IN than)) (DT a)) (NN minute)) (PP (IN before) (BASENP (PRPD his) (NN stick) (NN swinging) (NN incident))))))))))))))))) (PERIOD .))