Complex sentence: A study published in 2009 examined the interaction between Vitamin D from dietary and other sources in a cohort of 68,611 men and women did not demonstrate a significant link between Vitamin D deficiency and melanoma risk.
Split into simpler sentences: A study published in 2009 examined the interaction between melanoma risk and Vitamin D from dietary and other sources, in a cohort of 68,611 men and women. It did not find a significant link between Vitamin D deficiency and melanoma risk.