Complex sentence: Catherine was stripped of her title as queen within 16 months, in November 1541, and beheaded three months later, on the grounds of treason for committing adultery while married to the King.
Split into simpler sentences: Catherine was stripped of her title as queen within 16 months, in November 1541. She was beheaded three months later, on the grounds of treason for committing adultery while married to the King.