text: Davros experimented on living Kaled cells to find the ultimate mutated form of the Kaled species and placed the subjects in tank-like `` travel machines '' whose design was based on his own life-support chair .
simplified: Davros experimented on living Kaled cells to find the ultimate mutated form of the Kaled species and placed the subjects in `` travel machines '' whose design was based on his own life-support chair .