Complex sentence: Although he still engaged in the practice of law, he resigned from his teaching job in 1931 and reentered politics when he ran and won a senate seat and was subsequently elected its majority floor leader in 1934.
Split into simpler sentences: Although he still engaged in the practice of law, he resigned from his teaching job in 1931 and reentered politics. He ran and won a senate seat and was subsequently elected majority floor leader in 1934.