In the sentence
a lot of our modern conveniences are contributing to our unhealthy lifestyle, for example we often use a car instead of walk to the local shops.
Is it correct to use a comma before for example?
It sounds more natural to to me to use a period and start a new sencence with for example, but isn't there a rule that says that it is gramatically wrong to start a new sentence with conjunction? Or maybe for example is not a conjunction? What about adding a comma after for example
Note that I am taking the IELTS exam, so I would like to know the "correct" way.
Thanks for your time.