Complex sentence: The large pressure from the Mach 3.2 airflow ripped the fuselage forebody from the wing planform, the crew were unable to escape at this high speed as the forebody tumbled down towards the sea, the crew then managed to eject from the forebody.
Split into simpler sentences: The large pressure from the Mach 3.2 airflow "ripped the fuselage forebody from the wing planform". The crew were unable to escape at this high speed as the forebody tumbled down towards the sea, the crew then managed to eject from the forebody.