I rather doubt a 737-200 is going to have a DFDR. More likely one of the old analog tape units - and impact loads/ROD are not likely...
As for the fuselage breaking into three pieces - sorry but that's basically just physics. The strongest bit of the fuselage is the wing box (by a considerable margin since it carries both the total wing loads and total fuselage loads) - that's not going to be the first thing to let go if the fuselage is overstressed. It'll fail in front and/or behind the wing box - so you get the front and rear fuselage sections breaking off from the wing box.
Like I said, basic physics.