Complex sentence: The kefir grains initiating the fermentation are a combination of lactic acid bacteria and yeasts in a matrix of proteins, lipids, and sugars, and this symbiotic culture of bacteria and yeast (or SCOBY) forms "grains" that resemble cauliflower.
Split into simpler sentences: The kefir grains initiating the fermentation are a combination of lactic acid bacteria and yeasts in a matrix of proteins, lipids, and sugars. This symbiotic culture of bacteria and yeast (or SCOBY) forms "grains" that resemble cauliflower.