Complex sentence: Much of this bureaucratic method of organisation required re-evaluation however during the 1990's SAHA was primarily concerned with making the archive responsive to the growing number of post-apartheid researchers and collecting documents in danger of destruction.
Split into simpler sentences: Much of this bureaucratic method of organisation required re-evaluation. During the 1990's SAHA was primarily concerned with making the archive responsive to the growing number of post-apartheid researchers and collecting documents in danger of destruction.