I hope you can understand the corrections this way... Two small errors. let me know if there is a word or sentence or phrase that you didn't understand! I will try to think more on the "since" question...
But the fact that our driver took us there before showing us any of the attraction left quite an impression on us. He lost both of his parents in that war which explains why it was important to him.
Burlington in Vermont is one of the healthiest cities in the entire United States of America. The capital of Vermont is Montpellier. Apart from that Vermont offers a lot of green hills and many lakes. | 
