Complex sentence: With Catherine of Aragon and Anne Boleyn dead, relations between Charles and Henry improved considerably, and Henry concluded a secret alliance with the Emperor and decided to enter the Italian War in favour of his new ally.
Split into simpler sentences: With Catherine of Aragon and Anne Boleyn dead, relations between Charles and Henry improved considerably, and Henry concluded a secret alliance with the Emperor. He decided to enter the Italian War in favour of his new ally.