Complex sentence: One study examining multiple possible mechanisms of how previous behavior influences the present found little support for the familiarity heuristic and tends to conclude instead that the influence of past behavior on a present one decreased when subjects were distracted.
Split into simpler sentences: One study examining multiple possible mechanisms of how previous behavior influences present behavior found little support for the familiarity heuristic. The study showed that the influence of past behavior on a present one decreased when subjects were distracted.