Complex sentence: After some 7,000 hours of development testing, up to a simulated altitude of 70,000 feet (21,300 m) and a forward speed of Mach 2.3, the Orenda Iroquois program was canceled, along with the Arrow in February 1959.
Split into simpler sentences: After some 7,000 hours of development testing, up to a simulated altitude of 70,000 feet (21,300 m) and a forward speed of Mach 2.3. The Orenda Iroquois program was canceled, along with the Arrow in February 1959.