Complex sentence: Ursula Thorpe gave the letter to her son, whose reaction was to draft a quasi-legal statement rejecting the "damaging and groundless accusations" and accusing Scott of attempting to blackmail him.
Split into simpler sentences: Ursula Thorpe gave the letter to her son. Thorpe's reaction was to draft a quasi-legal document rejecting the "damaging and groundless accusations" and accusing Scott of attempting to blackmail him.