Complex sentence: The M9 used the same chassis and mechanical components as the M5 but laid out to provide similar stowage, access to the radios from the inside, rear doors, and a pedestal machine gun mount as the M2.
Split into simpler sentences: The M9 used the same chassis and mechanical components as the M5. It was laid out to provide similar stowage, access to the radios from the inside, rear doors, and a pedestal machine gun mount as with the M2.