Which of the following is the correct way to form the sentence?
When we were children our parents let us sell lemonade in front of our house times have changed, however.
When we were children; our parents let us sell lemonade in front of our house, times have changed, however.
When we were children, our parents let us sell lemonade in front of our house, times have changed, however.
When we were children, our parents let us sell lemonade in front of our house; times have changed, however.