Complex sentence: With no one to claim him as their own, Akhter spent 40 years of his life within the same prison, never leaving its premises; until he was spotted by Ansar Burney during a visit to the prison and released.
Split into simpler sentences: With no one to claim him, he spent forty years of his life in the same prison, never leaving its premises. He was spotted by Ansar Burney during a visit to the prison and released.