Complex sentence: The conkers were used as a source of starch for fermentation using the "Clostridium acetobutylicum" method devised by Chaim Weizmann to produce acetone for use as a solvent for the production of cordite, which was then used in military armaments.
Split into simpler sentences: The conkers were used as a source of starch for the fermentation via the "Clostridium acetobutylicum" method devised by Chaim Weizmann to produce acetone. The aim was to produce acetone for use as solvent which aided in the production of cordite, which was then used in military armaments.