Complex sentence: Early on, Marcel's research regarding unconscious reading and ambiguous words gained attention, leading up to the two publications addressing nonconscious perceptual processing in the same issue of Cognitive Psychology in 1983 gained much attention in the field.
Split into simpler sentences: Early on, Marcel's research regarding unconscious reading and ambiguous words gained attention. In 1983, his two publications addressing nonconscious perceptual processing in the same issue of Cognitive Psychology created a significant impact in the field.