Complex sentence: The levels-of-processing effect, identified by Fergus I. M. Craik and Robert S. Lockhart in 1972, describes memory recall of stimuli as a function of the depth of mental processing.
Split into simpler sentences: The levels-of-processing effect was identified by Fergus I. M. Craik and Robert S. Lockhart in 1972. They described memory recall of stimuli as a function of the depth of mental processing.