Less than a year after being elected to lead the oldest state agency in Texas, Land Commissioner George P. Bush has dramatically remade the General Land Office by ousting most of its longtime leaders and replacing many with people with ties to his campaign and family. Eleven of the top 18 officials on the agency’s organizational chart a year ago have been fired or forced out or have quit, and more could leave soon in an overhaul that Bush has described as a “reboot.” In their place, Bush, a former Fort Worth resident, has given top jobs to two of...