YOU SAID:

i told my mother that i saw an alien in the yard.

INTO JAPANESE

私は庭で外国人を見た私の母を言った。

BACK INTO ENGLISH

I told my mother I saw aliens in the garden.

INTO JAPANESE

私は庭でエイリアンを見た私の母に言った。

BACK INTO ENGLISH

I told my mother I saw aliens in the garden.