( ( ( Asexual reproduction ) ( of protozoans ) ) ( ( occurs ( when ( ( the cell ) ( ( divides ( in half ) ) ( by ( binary fission ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Asexual) (NN reproduction)) (PP (IN of) (NP (NNS protozoans)))) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN cell)) (VP (VBZ divides) (PP (IN in) (NP (NN half))) (PP (IN by) (NP (JJ binary) (NN fission))))))) (. .)))
Asexual reproduction of protozoans occurs when the cell divides in half by binary fission.
(ROOT (S (NP (NP (NNP Reproduction)) (PP (IN in) (NP (JJ prokaryotic) (NNS cells)))) (VP (VBZ is) (PP (IN by) (NP (JJ binary) (NN fission) (, ,) (NN enlargement) (CC and) (NN division)))) (. .)))