YOU SAID:

i once had a cat by the pool and pizza but a ninja seagull came and ate my pizza so i gave it my cat in exchange for my pizza.

INTO JAPANESE

私はかつてプールとピザのそばに猫を飼っていたが、忍者カモメがやってきてピザを食べたので、ピザと引き換えに猫にあげた。

BACK INTO ENGLISH

I used to keep a cat near the pool and pizza, but a ninja seagull came and ate pizza, so I gave him a cat in exchange for pizza.

INTO JAPANESE

私は猫をプールとピザの近くに飼っていましたが、忍者のカモメが来てピザを食べたので、ピザと引き換えに猫を飼っていました。

BACK INTO ENGLISH

I kept the cat near the pool and pizza, but a ninja seagull came and ate pizza, so I kept a cat in exchange for pizza.

INTO JAPANESE

私はプールとピザの近くに猫を飼っていたが、忍者カモメが来てピザを食べたので、ピザと引き換えに猫を飼った。

BACK INTO ENGLISH

I had a cat near the pool and pizza, but a ninja seagull came and ate pizza, so I kept a cat in exchange for pizza.

INTO JAPANESE

私はプールとピザの近くに猫を飼っていたが、忍者カモメが来てピザを食べたので、ピザと引き換えに猫を飼った。

BACK INTO ENGLISH

I had a cat near the pool and pizza, but a ninja seagull came and ate pizza, so I kept a cat in exchange for pizza.