Complex sentence: Fibronectin is a high molecular weight glycoprotein containing about 5% carbohydrate that bind to receptor proteins spanning the cell membrane called integrins and to extracellular matrix components such as collagen, fibrin and heparin.
Split into simpler sentences: Fibronectin is a high molecular weight glycoprotein containing about 5% carbohydrate that bind to receptor proteins spanning the cell membrane called integrins and to the extracellular matrix. It can also specifically bind to other molecules such as collagen, fibrin and heparin.