Complex sentence: His father had been a charter member of the Steamboat Company of Georgia and by the time of his father's death when Gazaway was 29, the son had become active in the shipping business in Savannah and Augusta.
Split into simpler sentences: His father had been a charter member of the Steamboat Company of Georgia. By the time of his father's death when Gazaway Lamar was 29, the son had become active in the shipping business in Savannah and Augusta.