YOU SAID:

i'm going to the store because i need to buy more parts for my computer and i also need to buy cat food and i also need to buy food for my dog.

INTO JAPANESE

コンピューターの部品をもっと買う必要があるし、猫の餌も買う必要があるし、犬の餌も買う必要があるので、店に行きます。

BACK INTO ENGLISH

I need to buy more computer parts, I need to buy cat food, I need to buy dog food, so I go to the store.

INTO JAPANESE

もっとコンピューターの部品を買う必要がある、猫の餌を買う必要がある、犬の餌を買う必要があるので店に行きます。

BACK INTO ENGLISH

I need to buy more computer parts, I need to buy cat food, I need to buy dog food, so I go to the store.