Complex sentence: There are two basic types of ball point pens: disposable and refillable; disposable pens are chiefly made of plastic throughout and discarded when the ink is consumed; refillable pens are metal and some plastic and tend to be much higher in price.
Split into simpler sentences: There are two basic types of ball point pens: disposable and refillable. Disposable pens are chiefly made of plastic throughout and discarded when the ink is consumed; refillable pens are metal and some plastic and tend to be much higher in price.