Complex sentence: Weigl continued his research on typhus after the war, and after his death, his studies were picked up by his friends, students, and his second wife, Anna-Herzig Weigl.
Split into simpler sentences: Weigl continued his research on typhus after the war. After his death, his studies were picked up by his friends, students, and his second wife, Anna-Herzig Weigl.