Complex sentence: During his trial, Tõnisson neither regretted anything nor gave up any information about other politicians who opposed the Soviets.Whereabouts of Tõnisson after the trial and the circumstances of his death still remain a mystery.
Split into simpler sentences: During his trial, Tõnisson neither regretted anything nor gave up any information about other politicians who opposed the Soviets. The exact whereabouts of Tõnisson after the trial and the circumstances of his death remain a mystery.