Simplify the following text for a Grade 10 native English-speaking person.
Original: One day later , the 50th Redstone rocket was successfully launched from Johnston Atoll in the south Pacific as part of Operation Hardtack I. Two years later , NASA opened the Marshall Space Flight Center at Redstone Arsenal in Huntsville , and the ABMA development team led by von Braun was transferred to NASA .
Simplified: Von Braun started work at the Army 's new Redstone Arsenal in Huntsville , Alabama , which later became NASA 's Marshall Space Flight Center .