( ( If ( ( the period ) ( is ( ( more ( than several ) ) hours ) ) ) ) ( , ( ( the time ) ( ( can ( be ( divided ( into blocks ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN period)) (VP (VBZ is) (NP (QP (RBR more) (IN than) (JJ several)) (NNS hours))))) (, ,) (NP (DT the) (NN time)) (VP (MD can) (VP (VB be) (VP (VBN divided) (PP (IN into) (NP (NNS blocks)))))) (. .)))
If the period is more than several hours, the time can be divided into blocks.
(ROOT (S (NP (NNS Bacteria)) (VP (MD may) (VP (VB divide) (NP (NP (QP (JJ several) (NNS times))) (NP (DT an) (NN hour))))) (. .)))