Complex sentence: The board's letter followed an investigation by state health officials that reported there were "no deficiencies" in Carhart's handling of the situation, and that the death could have happened during birth as well.
Split into simpler sentences: The board's letter followed an investigation by state health officials that reported there were "no deficiencies" in Carhart's handling of the situation. The report also said that the death could have happened during birth as well.