Complex sentence: Though the Bonus Army incident did not derail the careers of the military officers involved, it proved politically disastrous for Hoover, and is considered to be a contributing factor leading to him losing the 1932 election in a landslide to Franklin D. Roosevelt.
Split into simpler sentences: Though the Bonus Army incident did not derail the careers of the military officers involved, it proved politically disastrous for Hoover. He lost the 1932 election in a landslide to Franklin D. Roosevelt.