Jǐnguǎn shēnxiàn-língyǔ, tā réngrán jiānchí zìjǐ de xìnniàn.
Even though he was imprisoned, he still held to his convictions.
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history
囹圄 (língyǔ) is one of the oldest words for 'jail' in Chinese, found in 《说文》 (囹，狱也) and 《华严音义》 (囹圄，周之狱名也 - the prison-name of the Zhou dynasty). 身陷 means 'one's body falls into', so the whole phrase paints the literal image of a person sunk inside the ancient Zhou prison.
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Formal/literary. Newsroom and court-document language. Everyday speech prefers 坐牢 (zuòláo) or 进监狱 (jìn jiānyù).
