YOU SAID:

my pants are blue and my pet unicorn is eating my cousin mabel

INTO JAPANESE

私のズボンは青で、私のペットのユニコーンは私のいとこのmabelを食べています

BACK INTO ENGLISH

My pants are blue, my pet's unicorn is eating my cousin mabel

INTO JAPANESE

私のズボンは青いです、私のペットのユニコーンは私のいとこのmabelを食べています

BACK INTO ENGLISH

My pants are blue, my pet's unicorn is eating my cousin mabel