Breakdown of kono shi no jinkou wa gojuumannin gurai desu.
ですdesu
to be
はwa
topic particle
のno
possessive case particle
このkono
this ... adnominal
五十gojuu
50
〜人〜nin
people counter
万man
ten thousands counter
ぐらいgurai
about; approximately
人口jinkou
population
市shi
city
市 is a political term that designates a city as an administrative unit. It's equivalent to the English word city when used in the context of a municipality.
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