Complex sentence: First Financial Bank is a regional bank with 73 retail branches operated by First Financial Corporation and based in Terre Haute, Indiana; not only is it the oldest national bank in Indiana, it is also Vigo County's only publicly traded company.
Split into simpler sentences: First Financial Bank is a regional bank with 73 retail branches operated by First Financial Corporation and based in Terre Haute, Indiana. The oldest national bank in Indiana, it is also Vigo County's only publicly traded company.