Complex sentence: He was paroled after 34 months, in 1974, under the "indeterminate sentencing" program popular at the time, which allowed parole boards to release offenders as soon as they demonstrated evidence of rehabilitation.
Split into simpler sentences: He was paroled after 34 months, in 1974, under the "indeterminate sentencing" program that was popular at the time. This program allowed parole boards to release offenders as soon as they demonstrated evidence of rehabilitation.