YOU SAID:

I ate my paternal grandmother's niece's cat and then they got mad at me.

INTO JAPANESE

私は父方の祖母の姪の猫を食べた後、私は怒ってしまった。

BACK INTO ENGLISH

I got angry after I ate a paternity grandmother's niece's cat.

INTO JAPANESE

父親の姪の猫を食べた後、私は怒った。

BACK INTO ENGLISH

I got angry after eating my father's niece's cat.

INTO JAPANESE

私は父の姪の猫を食べた後に怒った。

BACK INTO ENGLISH

I got angry after eating my father's niece's cat.