( ( The pre-embryo ) ( ( may ( ( divide ( several times ) ) ( while ( in ( the incubator ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN pre-embryo)) (VP (MD may) (VP (VBP divide) (NP (JJ several) (NNS times)) (SBAR (IN while) (FRAG (PP (IN in) (NP (DT the) (NN incubator))))))) (. .)))
The pre-embryo may divide several times while in the incubator.
(ROOT (S (NP (NNS Bacteria)) (VP (MD may) (VP (VB divide) (NP (NP (QP (JJ several) (NNS times))) (NP (DT an) (NN hour))))) (. .)))