Complex sentence: The lawyer mentions a different possibility: a wrongful birth lawsuit against the OB/GYN that treated Charlotte during her pregnancy, meaning that they are saying that if they had known earlier that their fetus had OI, they could have aborted.
Split into simpler sentences: The lawyer mentions a different possibility: a wrongful birth lawsuit against the ob/gyn that treated Charlotte during her pregnancy. The suit the lawyer suggest was a wrongful birth lawsuit, meaning that they are saying that if they had known earlier that their fetus had OI, they would have aborted.