Complex sentence: The technician, Richard Thompson (Leland Orser), is in truth an ex-forensic cop named Marcus Andrews seeking revenge against Rhyme, whose testimony helped convict him of planting false evidence at crime scenes.
Split into simpler sentences: The technician, Richard Thompson (Leland Orser), is in truth an ex-forensic cop named Marcus Andrews. He has been seeking revenge against Rhyme, whose testimony helped convict him of planting false evidence at crime scenes.