Complex sentence: Tarnow (2010) finds that in a classic experiment typically argued as supporting a 4 item buffer by Murdock (1962) there is in fact no evidence for such and thus the "magical number", at least in the Murdock experiment, is 1.
Split into simpler sentences: Tarnow (2010) finds that in a classic experiment typically argued as supporting a 4 item buffer by Murdock (1962). There is in fact no evidence for such and thus the "magical number", at least in the Murdock experiment, is 1.