( ( half ( of ( ( the ( original number ) ) ( of ( ( chromosomes , ) ( if ( ( the ( parental cell ) ) ( was ( diploid ( -LRB- ( ( ( having ( ( two sets ) ( of chromosomes ) ) ) ( in ( ( a ( full complement ) ) ( of chromosomes ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NN half)) (PP (IN of) (NP (NP (DT the) (JJ original) (NN number)) (PP (IN of) (NP (NP (NNS chromosomes)) (, ,) (SBAR (IN if) (S (NP (DT the) (JJ parental) (NN cell)) (VP (VBD was) (VP (VBN diploid) (PRN (-LRB- -LRB-) (S (VP (VBG having) (NP (NP (CD two) (NNS sets)) (PP (IN of) (NP (NNS chromosomes)))) (PP (IN in) (NP (NP (DT a) (JJ full) (NN complement)) (PP (IN of) (NP (NNS chromosomes))))))) (-RRB- -RRB-)))))))))) (. .)))
half of the original number of chromosomes, if the parental cell was diploid (having two sets of chromosomes in a full complement of chromosomes).
(ROOT (S (NP (DT A) (JJ diploid) (NN cell)) (VP (VBZ is) (NP (NP (DT a) (NN cell)) (PP (IN with) (NP (CD two) (NNS chromosomes))))) (. .)))