Complex sentence: In addition to using chemotaxis to avoid areas of low pH, "H. pylori" also neutralizes the acid in its environment by producing large amounts of urease, which breaks down the urea present in the stomach to carbon dioxide and ammonia.
Split into simpler sentences: In addition to using chemotaxis to avoid areas of low pH, "H. pylori" also neutralizes the acid in its environment. It does this by producing large amounts of urease, which breaks down the urea present in the stomach to carbon dioxide and ammonia.