Complex sentence: Glycerate 3-phosphate (GP) or 3-phosphoglycerate (3PG) is a 3-carbon molecule that is a metabolic intermediate in both glycolysis and the Calvin cycle.
Split into simpler sentences: Glycerate 3-phosphate (GP) or 3-phosphoglycerate (3PG). This 3-carbon molecule is a metabolic intermediate in both glycolysis and the Calvin cycle.