Complex sentence: In April 1861, David R. Wingate and one of his sons enlisted in the Sabine Pass Guard, whereas David would be appointed as chairman of safety for Sabine Pass, as well as Confederate States marshal of the east Texas region.
Split into simpler sentences: In April 1861, Wingate and one of his sons enlisted in the Sabine Pass Guard. David was appointed as chairman of safety for Sabine Pass, as well as Confederate States marshal of the east Texas region.