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Spitfires did not break up in spin recovery but some did break up recovering from dives
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And what are doing in spin recovery?
Asymmetrical loading....
With a significant yaw-wise pitch up.....in the Spitfire
An airplane with a neutral or negative dynamically stable airplane with 3/4 inch stick travel at 5 lbs per G.....
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SPINS. Since a stabilized spin is not essentially different from a stall in any element other than rotation, the same load factor considerations apply as those which apply to stall recovery. Since spin recoveries usually are effected with the nose much lower than is common in stall recoveries, higher airspeeds and consequently higher load factors are to be expected. The load factor in a proper spin recovery will usually be found to be about 2.5 G's.
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http://avstop.com/ac/flighttrainghan...maneuvers.html
Asymmetrical loading is the mechanism. It significantly degrades the airframe load factor limits when you start adding multiple axis accelerations. You are approaching the airframe limits on normal recovery. Stomp the rudder too much or add in some gusting and you can break the airplane.
Read the pilot notes as it will tell you how to operate the aircraft so that is stays within its airworthy limitations.