Complex sentence: The correlation between the two factors is therefore weak, although statistically significant, and these studies do not imply that there are no short people who are highly intelligent, or that changes in physical height have a direct effect on cognitive ability.
Split into simpler sentences: The correlation between the two factors is therefore weak, although statistically significant. Consequently, these studies do not imply that there are no short people who are highly intelligent or that variations in stature have a direct effect on cognitive ability.