Complex sentence: Bush served as president of the second women's rights convention in 1848 immediately following the first Seneca Falls Convention, and thus became the first American woman to serve as president of a convention with both men and women in the audience.
Split into simpler sentences: Bush served as president of the second women's rights convention in 1848 immediately following the first Seneca Falls Convention. Abigail Bush was the first woman to serve as president of a convention with both men and women in the audience.