Complex sentence: Texture is partly a byproduct of the chemistry going on in the fermentation, which does several important things such as create the different enzymes (protease and amylase) needed to leaven bread.
Split into simpler sentences: Texture is partly a byproduct of the chemistry going on in the fermentation. The fermentation does several important things such as create the different enzymes (protease and amylase) needed to leaven bread.