YOU SAID:

So there was a cat who shat his pants

INTO JAPANESE

だから彼のズボンを粉砕した猫がいました

BACK INTO ENGLISH

So there was a cat that pulverized his pants

INTO JAPANESE

それで彼のズボンを粉砕した猫がいました

BACK INTO ENGLISH

So there was a cat that pulverized his pants