Complex sentence: ZS-9, a selective oral sorbent which traps potassium ions throughout the gastrointestinal tract, is being developed by ZS Pharma for the treatment of hyperkalemia (elevated serum potassium levels).
Split into simpler sentences: ZS-9 is a selective oral sorbent that traps potassium ions throughout the gastrointestinal tract. It is being developed by ZS Pharma for the treatment of hyperkalemia (elevated serum potassium levels).