please help me check my languange and correct it.thank you!

题目

please help me check my languange and correct it.thank you!
after many round of discussion, we finally come to a decision to make a social awareness advertisement about non smoking issues during the pregnancy.we come out with this idea when i accidentally see a cigaratte advertisement on a magazine .at the bottom there have a such warning:expectant mother smoking during prenancy will make the baby birth weight smaller and being born premature.suddenly,i have a thought that to use this concept to do my advertisement to alert our expectant.
not translate it but help me to check my english whether it is correct.

答案

After many rounds discussion,finally,we decite to make a social awareness advertisement on non smoking issues during the pregnancy.we get the idea from a cigaratte advertisement on a magazine.there is...