( ( Streptococcus ( pyogenes ( ( ( is ( ( ( a bacteria ) , ) ( so ( ( it ( reproduces ( by ( binary ( fission ( . ( Binary fission ) ) ) ) ) ) ) ( ( is ( ( a form ) ( of ( ( asexual reproduction ) ( in ( a ( single-celled organisms ) ) ) ) ) ) ) . ) ) ) ) ) ( ( This process ) ( occurs ( by ( ( one cell ) ( dividing ( into ( ( two cells ) ( of ( the ( same size ) ) ) ) ) ) ) ) ) ) ) . ) ) ) ( ( Binary fission ) ( ( is ( used ( by ( most prokaryotes ) ) ) ) . ) ) )
(ROOT (S (S (NP (NNS Streptococcus)) (VP (VBZ pyogenes) (SBAR (SINV (VP (VBZ is)) (NP (NP (DT a) (NNS bacteria)) (, ,) (SBAR (IN so) (SINV (S (NP (PRP it)) (VP (VBZ reproduces) (PP (IN by) (NP (NN binary) (NNP fission) (. .) (NNP Binary) (NNP fission))))) (VP (VBZ is)) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NP (JJ asexual) (NN reproduction)) (PP (IN in) (NP (DT a) (JJ single-celled) (NNS organisms)))))) (. .)))) (S (NP (DT This) (NN process)) (VP (VBZ occurs) (PP (IN by) (NP (NP (CD one) (NN cell)) (VP (VBG dividing) (PP (IN into) (NP (NP (CD two) (NNS cells)) (PP (IN of) (NP (DT the) (JJ same) (NN size)))))))))) (. .))))) (NP (NNP Binary) (NNP fission)) (VP (VBZ is) (VP (VBN used) (PP (IN by) (NP (JJS most) (NNS prokaryotes))))) (. .)))
Streptococcus pyogenes is a bacteria, so it reproduces by  binary fission.  Binary fission is a form of asexual reproduction in a  single-celled organisms.  This process occurs by one cell dividing into two  cells of the same size.  Binary fission is used by most prokaryotes.
(ROOT (S (NP (NNP Fission)) (VP (VBZ takes) (NP (NP (NN place)) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (NN animal)) (ADVP (RB simply)) (VP (VBZ divides) (PP (IN into) (NP (CD two) (NNS parts)))))))) (. .)))