Complex sentence: In appellate review the record of the trial court must be certified by the clerk of the trial court and transmitted to the appellate body, most appellate courts do not have the authority to hear testimony or take evidence, they must rely upon the record below.
Split into simpler sentences: In appellate review the record of the trial court must be certified by the clerk of the trial court and transmitted to the appellate body. Most appellate courts do not have the authority to hear testimony or take evidence, but must rely upon the record below.