Complex sentence: During his captivity, McCright detailed the personal backgrounds and wartime injuries of 2,194 of his fellow prisoners in four journals, which he hid under the floorboards of the prisoner barracks.
Split into simpler sentences: During his captivity, McCright maintained four ledgers that detailed the personal backgrounds and wartime injuries of 2,194 of his fellow prisoners. McCright hid his journals under the floorboards of the prisoner barracks.