Complex sentence: These chondrogenic cells will then differentiate into chondroblasts which will then synthesize the cartilage ECM (extra cellular matrix) consisting of ground substance (proteoglycans, glycosaminoglycans for low osmotic potential) and fibers.
Split into simpler sentences: These chondrogenic cells will then differentiate to chondroblasts which will then synthesize the cartilage ECM (extra cellular matrix). Which consists of ground substance (proteoglycans, glycosaminoglycans for low osmotic potential) and fibers.