Complex sentence: In turn, SIL commenced an investigation (completed in 2005) which confirmed the abuse validity but did not publicly reveal what abuses were committed, by whom, or against how many of the women.
Split into simpler sentences: In turn, SIL commenced an investigation (completed in 2005) and claimed to have confirmed the abuse validity. The SIL did not publicly reveal what abuses were committed, by whom, or against how many of the women.