Complex sentence: March's uncle, General Peyton Conway March, was once Chief of Staff of the U.S. Army in World War I. His grandfather was the philologist Francis Andrew March, and his adopted daughter is the retired actress Lori March Williams.
Split into simpler sentences: March's uncle, General Peyton Conway March, was once Chief of Staff of the U.S. Army in World War I; his grandfather was the philologist Francis Andrew March. His adopted daughter is the retired actress Lori March Williams.