Meaning of いるとin 弥生時代にはいると…


So I found this sentence:

> 弥生時代にはいると食事の内容が大きく変化しました

I understand its meaning, something like

> In the Yayoi period, the food content changed a lot

However, 'In the Yayoi period' is a free translation, because I don't really
know what いると means. Does と work as 'when'? How would you translate that? A
literal translation would also help for better understanding.




The verb after 弥生時代に is 入る【はいる】 ("to enter (an age/season)"), not いる.

> ###
> [入る](https://dictionary.goo.ne.jp/word/%E5%85%A5%E3%82%8B_%28%E3%81%AF%E3%81%84%E3%82%8B%29/)
>
> 11 ある時期・地点に至る。「雨期に―・る」「月が山の陰に―・る」

Therefore the literal translation is:

> 弥生時代に入る【はいる】と...  
>  After entering the Yayoi period, ...  
>  When the Yayoi period began, ...




The verb after 弥生時代に is 入る【はいる】 ("to enter (an age/season)"), not いる.

> ###
> [入る](https://dictionary.goo.ne.jp/word/%E5%85%A5%E3%82%8B_%28%E3%81%AF%E3%81%84%E3%82%8B%29/)
>
> 11 ある時期・地点に至る。「雨期に―・る」「月が山の陰に―・る」

Therefore the literal translation is:

> 弥生時代に入る【はいる】と...  
>  After entering the Yayoi period, ...  
>  When the Yayoi period began, ...

