Complex sentence: This happened because the Wikipedia text was based on a secondary source, rather than on Chopra's own work; even after the article was corrected to make clear that Chopra acknowledges that the HIV virus causes AIDS, the correction was reverted four times over nine days.
Split into simpler sentences: This happened because the Wikipedia text was based on a secondary source, rather than on Chopra's own work. When the article was corrected to make clear that Chopra fully accepts that the HIV virus causes AIDS, the correction was reverted four times over nine days.