Complex sentence: This works due to the fact that gypsum salts, although not "soft" are still water permable and have a larger, more open structure, the results of which do not promote as hard a matrix as was repaced.
Split into simpler sentences: This works due to the fact that gypsum salts, although not "soft" are still water permable and have a larger more open structure. The results of which do not promote so hard a matrix as was repaced.