Breakdown of kono bunshou wa nagai desu.
ですdesu
to be
はwa
topic particle
このkono
this ... adnominal
長いnagai
long
文章bunshou
sentence
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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita
Hepburn romanizationwatashi wa chuugoku kara kimashita