Complex sentence: Hooper served as a member of the U.S. Railroad Labor Board (RLB) during the administration of President Warren G. Harding in the early 1920s, and as chairman of the RLB was a central figure in the 1922 Railroad Shopmen's Strike.
Split into simpler sentences: Hooper served as a member of the U.S. Railroad Labor Board (RLB) during the administration of President Warren G. Harding in the early 1920s. As chairman of the RLB, he was a central figure in the 1922 Railroad Shopmen's Strike.