AsWith its develoment, our lives are more exposed to a variety of TV programme or films today than the past few decades.
... ;you are comparing the lives today with ones in the past. So, you need to mention that.
It can be considered as a diversity of information but they can be also involved a lot harmful advertisement and programme which can affect our lives negetively so I am going to explain why there are more harm than good.
....as aliceNN comments, this sentence is too long and therefore it sounds too complicated. It is important that your sentences read clear to the reader. For that, the best way is to write short and simple sentences.
Nowadays, many parents are concerned their children who are exposed to a variety of TV programme which can be suggestive and violent.
... This sentence should have been in your introduction.