Complex sentence: His term as governor, 1921--1924, was unsuccessful, as severe economic hardship limited the opportunities to enact his proposed reforms in state government, and his great enemy the Anaconda Copper company mobilized its resources to defeat his reelection bid in 1924.
Split into simpler sentences: His term as governor, 1921--1924, was unsuccessful, as severe economic hardship limited the opportunities to enact his proposed reforms in state government. His great enemy, the Anaconda Copper company, mobilized its resources to defeat his reelection bid in 1924.