YOU SAID:

i walked to the store and i saw a cow

INTO JAPANESE

私は店に歩いて行きました、そして私は牛を見ました

BACK INTO ENGLISH

I walked to the store and I saw a cow

INTO JAPANESE

店に歩いて行くと牛が見えました

BACK INTO ENGLISH

When I walked to the store, I saw a cow

INTO JAPANESE

店に歩いていくと牛が見えました

BACK INTO ENGLISH

When I walked to the store, I saw a cow