Complex sentence: In 1950, there were no GOP candidates holding federal or statewide offices, the last having been elected in 1928, and Republicans would not be competitive in a statewide race for another dozen years and would not win a statewide election for twenty-two more years.
Split into simpler sentences: In 1950, there were no Republican candidates holding federal or statewide offices, the last having been elected in 1928. The GOP would not become competitive in a statewide race for another dozen years and would not win for twenty-two more years.