Complex sentence: In 1930, Jackson was elected to membership in the American Law Institute; in 1933, he was elected chairman of the American Bar Association's Conference of Bar Association Delegates (a predecessor to today's ABA House of Delegates).
Split into simpler sentences: In 1930, Jackson was elected to membership in the American Law Institute. In 1933, Jackson was elected chairman of the American Bar Association's Conference of Bar Association Delegates (a predecessor to today's ABA House of Delegates).