Complex sentence: On 22 March 1996, retired astronaut Robert F. Overmyer died at age 59 in the crash of the Allison turbine-powered VK-30 he was testing for stall recovery characteristics at aft C of G limits.
Split into simpler sentences: On 22 March 1996, retired astronaut Robert F. Overmyer died at age 59 in the crash of the Allison turbine-powered VK-30. He was testing the aircraft for stall recovery characteristics at aft C of G limits.