Complex sentence: The complete solidity of the M43 projectile causes its only drawback--it is stable even in tissue and begins to yaw only after traversing nearly 30 cm (one foot) of tissue.
Split into simpler sentences: The complete solidity of the M43 projectile causes its only drawback--it is very stable, even while traversing tissue. It begins to yaw only after traversing nearly 30 cm (one foot) of tissue.