Complex sentence: Sourdough starters are maintained over long periods of time and generally have fairly complex microbiological makeups, most notably including wild yeasts, lactobacillus, and acetobacteria.
Split into simpler sentences: Sourdough starters are maintained over long periods of time. These starters generally have fairly complex microbiological makeups, most notably including wild yeasts, lactobacillus, and acetobacteria.