Correct sentence:
The milk tanker carries milk to the city to be made into cheese, yogurt, and butter.
Why this is good (easy steps):
- The subject is the milk tanker — that is who the sentence is about.
- The verb is carries (or takes) — that tells what the tanker does.
- The object is milk — that is what the tanker moves.
- We add to be made into so it is clear the milk is turned into cheese, yogurt, and butter (the tanker does not make them).
- When listing three things, we use commas and an and before the last one: cheese, yogurt, and butter.
Other simple correct options:
- The milk tanker takes milk to the city so workers can make cheese, yogurt, and butter.
- A milk tanker carries milk to the city to be made into cheese, yogurt, and butter.
Original sentence was mostly right — these small changes just make the meaning a little clearer.