Lipsticks contain a wide variety of chemicals and those chemicals can damage lips oils

Can you repeat this sentence, but add in punctuation?
Lipsticks contain a wide variety of chemicals, and those chemicals can damage lips oils.
Oil has affected us humans in so many ways the last century

Can you repeat this sentence, but add in punctuation?
Oil has affected us humans in so many ways the last century.
The publication in English helps international observers who come to watch the parliamentary elections in their work

Can you repeat this sentence, but add in punctuation?
The publication in English helps international observers who come to watch the parliamentary elections in their work.