Complex sentence: As an alternative, sinus augmentation can be performed by a less invasive osteotome technique, in which the sinus membranes are lifted by gentle tapping of the sinus floor with the use of osteotomes.
Split into simpler sentences: As an alternative, sinus augmentation can be performed by a less invasive osteotome technique. The floor of the sinus is then lifted by tapping the sinus floor with the use of osteotomes.