Complex sentence: In a later variation, the capital would devolve upon the last survivor, effectively dissolving the trust and usually making the survivor very wealthy; it is this version that has often been the plot device for mysteries and detective stories.
Split into simpler sentences: In a later variation, the capital devolves upon the last survivor, effectively dissolving the trust and usually making the survivor very wealthy. It is this version that has often been the plot device for mysteries and detective stories.