Complex sentence: Phosphocarrier HPr protein, a small cytoplasmic protein, is a component of the phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS) major carbohydrate transport system in bacteria.
Split into simpler sentences: Phosphocarrier HPr protein is a small cytoplasmic protein that is a component of the phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS). The phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS) is a major carbohydrate transport system in bacteria.