Complex sentence: Once the deformity has been corrected, the frame is then left on the leg whilst the bone heals, typically this will take 3--6 months, depending on the nature and degree of deformity.
Split into simpler sentences: Once the deformity has been corrected, the frame is then left on the leg till the bone heals. This often takes 3--6 months, depending on the nature and degree of deformity.