If the medical treatment is free for local residents you will not have to pay

Can you repeat this sentence, but add in punctuation?
If the medical treatment is free for local residents, you will not have to pay.
If your principal customers are other companies you can start with the question of whether it is the customers or you yourselves that determine the products design and function

Can you repeat this sentence, but add in punctuation?
If your principal customers are other companies, you can start with the question of whether it is the customers or you yourselves that determine the product's design and function.
The language developed indigenously and retains many ancient Slavic features of pronunciation and grammar

Can you repeat this sentence, but add in punctuation?
The language developed indigenously and retains many ancient Slavic features of pronunciation and grammar.