Complex sentence: The prospect of marriage to the Countess of Essex on the horizon, Leicester finally drew a line under his relationship with Lady Douglas Sheffield, Other than she later claimed, they came to a friendly agreement over their son's custody.
Split into simpler sentences: The prospect of marriage to the Countess of Essex on the horizon, Leicester finally drew a line under his relationship with Lady Douglas Sheffield. Contrary to what she later claimed, they came to an amicable agreement over their son's custody.