YOU SAID:

I ate a strawberry last winter it was rotten

INTO JAPANESE

去年の冬にイチゴを食べたら腐っていた

BACK INTO ENGLISH

I ate strawberries last winter and they were rotten.

INTO JAPANESE

去年の冬にイチゴを食べたのですが、腐っていました。

BACK INTO ENGLISH

I ate strawberries last winter, but they were rotten.

INTO JAPANESE

去年の冬にイチゴを食べましたが、腐っていました。

BACK INTO ENGLISH

I ate strawberries last winter, but they were rotten.