( ( At ( ( the time ) ( of ( cell division ) ) ) ) ( ( ( a structure ) ( known ( as ( the phragmoplast ) ) ) ) ( ( appears ( across ( ( the center ) ( of ( the cell ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN At) (NP (NP (DT the) (NN time)) (PP (IN of) (NP (NN cell) (NN division))))) (NP (NP (DT a) (NN structure)) (VP (VBN known) (PP (IN as) (NP (DT the) (NN phragmoplast))))) (VP (VBZ appears) (PP (IN across) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (NN cell)))))) (. .)))
At the time of cell division a structure known as the phragmoplast appears across the center of the cell.
(ROOT (S (NP (NP (NNS Cells)) (PP (IN in) (NP (NP (JJ green) (NN algae) (NN divide)) (PP (IN along) (NP (NN cell) (NNS plates)))))) (VP (VBD called) (NP (NNS phragmoplasts))) (. .)))