Original sentence: After evacuating Peenemünde for the Alpenfestung (Alpine Fortress), Hoelzer returned to Peenemünde via motorcycle to look for portions of his PhD dissertation prior to surrending to United States forces at the end of World War II.Grandfather of Olympic Swimmer Margaret Hoelzer
Edited sentence: After evacuating Peenemünde for the Alpenfestung (Alpine Fortress), Hoelzer returned to Peenemünde via motorcycle to look for portions of his PhD dissertation prior to surrendering to United States forces at the end of World War II