YOU SAID:

i was in a store then a robber came and he tried to kill me so i shot him

INTO JAPANESE

私が店にいたとき、強盗が来て私を殺そうとしたので撃ちました。

BACK INTO ENGLISH

When I was in the store, a robber came and tried to kill me, so I shot him.

INTO JAPANESE

私が店にいるとき、強盗が来て私を殺そうとしたので、私は彼を撃ちました。

BACK INTO ENGLISH

When I was in the store, a robber came and tried to kill me, so I shot him.