YOU SAID:

Black mare had a colt named macaroni who had a colt named cheese

INTO JAPANESE

黒毛馬にはマカロニという名前の子馬がいて、その子馬にはチーズという名前の子馬がいた

BACK INTO ENGLISH

A black horse had a foal named Macaroni, and that foal had a foal named Cheese.

INTO JAPANESE

黒い馬にはマカロニという名前の子馬がいて、その子馬にはチーズという名前の子馬がいました。

BACK INTO ENGLISH

A black horse had a foal named Macaroni, and that foal had a foal named Cheese.