Complex sentence: Walmiki was caught and convicted, and served two concurrent seven-year sentences for assault and robbery, not for rape or sexual molestation, nor for the "unnatural sexual offence" (which could have got him a ten-year sentence by itself).
Split into simpler sentences: Walmiki was caught and convicted, and he served a seven-year concurrent sentence for assault and robbery. Not for rape or sexual molestation, nor for the "unnatural sexual offence" (which could have got him a ten-year sentence by itself).