Complex sentence: His research has proven that the accepted assumption of a more or less static relationship of implants and the jaw is, in many cases, false because as we age, the skull continues to grow, we lose bone volume and soft tissue in the face recedes.
Split into simpler sentences: His research has proven that the accepted assumption of a more or less static relationship of implants and the jaw is, in many cases, false. This is because as we age, the skull continues to grow, we lose bone volume and soft tissue in the face recedes.