Complex sentence: Her government work began as a result of her longtime friendship with Herbert Hoover and his wife Lou Henry Hoover, both of whom she had known in California; Gilbreth had presided over the Women's Branch of the Engineers' Hoover for President campaign.
Split into simpler sentences: Her government work began as a result of her longtime friendship with Herbert Hoover and his wife Lou Henry Hoover, both of whom she had known in California. Gilbreth has presided over the Women's Branch of the Engineers' Hoover for President campaign.