Good sentence — you did well! It is mostly correct, but one small part can be made easier to understand.
- Clear version 1: The milk tanker carries milk to the city where it is made into cheese, yogurt, and butter.
- Clear version 2: The milk tanker carries milk to a factory in the city so people can make cheese, yogurt, and butter.
Why change it?
- "The milk tanker" = the big truck with milk.
- "carries" = it takes the milk somewhere.
- "to the city" = the place the milk goes.
- "to be made" is a little tricky. It means the milk will become cheese, yogurt, and butter. Saying "where it is made" or "so people can make" is easier to understand.
Choose the one you like best and great job writing the sentence!