Complex sentence: Study into the cardioprotective effects of resveratrol is based on the research of Dipak K. Das, however, who has been found guilty of scientific fraud and many of his publications related to resveratrol have been retracted.
Split into simpler sentences: Study into the cardioprotective effects of resveratrol is based on the research of Dipak K. Das. However, he has been found guilty of scientific fraud, and many of his publications related to resveratrol have been retracted.