(S (S (NP (NP (BASENP (DT The) (NN officer)) (COMMA ,) (BASENP (NNP Jeffrey) (NNP Stenroos))) (PRN (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VBD had) (VP (VP (VBN worked) (PP (IN for) (BASENP (DT the) (NNP Los) (NNP Angeles) (NNP Unified) (NNP School) (NNP District) (NN police)))) (PP (IN for) (BASENP (NN eight) (NNS years))))))) (COMMA ,))) (VP (VBD caused) (S (NP (BASENP (NN thousands)) (PP (IN of) (BASENP (NNS students)))) (VP (TO to) (VP (VP (VB remain) (PP (IN on) (BASENP (NN lockdown)))) (PP (IN for) (BASENP (NNS hours)))))))) (PERIOD .))