YOU SAID:

mr smith has a cat whose name is hard to pronounce and so some times it isn't said correctly

INTO JAPANESE

ミスター・スミスには猫の名前が発音しにくいので、時々それが正しく言われない

BACK INTO ENGLISH

The name of the cat is hard to pronounce to Mr. Smith, so sometimes it's not said correctly

INTO JAPANESE

猫の名前はスミス氏に発音しにくいので、時々それが正しく言われない

BACK INTO ENGLISH

Cat names are hard to pronounce to Mr Smith, so sometimes it's not said correctly

INTO JAPANESE

猫の名前はスミス氏に発音しにくいので、時々それが正しく言われない

BACK INTO ENGLISH

Cat names are hard to pronounce to Mr Smith, so sometimes it's not said correctly