( ( Sometimes ( ( a dose ) ( may ( be ( required ( ( several times ) ( an hour ) ) ) ) ) ) ) ; )
(ROOT (S (VP (VBG Sometimes) (SBAR (S (NP (DT a) (NN dose)) (VP (MD may) (VP (VB be) (VP (VBN required) (NP (NP (QP (JJ several) (NNS times))) (NP (DT an) (NN hour))))))))) (: ;)))
Sometimes a dose may be required several times an hour;
(ROOT (S (NP (NNS Bacteria)) (VP (MD may) (VP (VB divide) (NP (NP (QP (JJ several) (NNS times))) (NP (DT an) (NN hour))))) (. .)))