Complex sentence: Ancient fermented food processes, such as making bread, wine, cheese, curds, idli, dosa, etc., some of which are some 6,000 yr old, and developed long before man had any knowledge of the existence of the micro-organisms involved.
Split into simpler sentences: Ancient fermented food processes, such as making bread, wine, cheese, curds, idli, dosa, etc., can be dated to more than 6,000 yr ago. They were developed long before man had any knowledge of the existence of the micro-organisms involved.