Complex sentence: On the trial's third day, Trotter produces a surprise witness, FBI analyst George Wilbur, who testifies that the pattern and chemical analysis of the tire marks left at the crime scene are identical to the tires on Billy's Buick.
Split into simpler sentences: On the trial's third day, Trotter produces a surprise witness, FBI analyst George Wilbur. Mr. Wilbur testifies that the pattern and chemical analysis of the tire marks left at the crime scene are identical to the tires on Billy's Buick.