Complex sentence: Mathews was nominated by President Franklin D. Roosevelt on March 13,1935, to a seat vacated by William Henry Sawtelle; he was confirmed by the United States Senate on March 20,1935, and received his commission on March 23,1935.
Split into simpler sentences: Mathews was nominated by President Franklin D. Roosevelt on March 13,1935, to a seat vacated by William Henry Sawtelle. He was confirmed by the United States Senate on March 20,1935, and received his commission on March 23,1935.