YOU SAID:

I bought a banana and I eat it after breakfast

INTO JAPANESE

私はバナナを買って、朝食後に食べています。

BACK INTO ENGLISH

I bought bananas and eaten after breakfast.

INTO JAPANESE

私バナナを買って、朝食後食べる。

BACK INTO ENGLISH

I bought a banana, eat breakfast then.

INTO JAPANESE

私はバナナを買って、朝食を食べる。

BACK INTO ENGLISH

I bought a banana, eat breakfast.

INTO JAPANESE

私はバナナを買って、朝食を食べる。

BACK INTO ENGLISH

I bought a banana, eat breakfast.