Complex sentence: Merely accelerating would typically be enough to evade a surface-to-air missile, and at sustained speeds of mach 3.2 + the plane was faster than the Soviet Union's principal interceptor, the Mikoyan-Gurevich MiG-25.
Split into simpler sentences: Merely accelerating would typically be enough to evade a surface-to-air missile. At sustained speeds of Mach 3.2 +, the plane was faster than the Soviet Union's principal interceptor, the Mikoyan-Gurevich MiG-25.