Complex sentence: Yorkists continued to be imprisoned or executed up to the reign of Elizabeth I of England with the Tudors ruthlessly extinguishing rival claims to the throne, but many legitimate and illegitimate lines of descent outside politics remained unmolested and survived to the present.
Split into simpler sentences: Yorkists continued to be imprisoned or executed up to the reign of Elizabeth I of England with the Tudors ruthlessly extinguishing rival claims to the throne. Many legitimate and illegitimate lines of descent outside of politics remained unmolested and have survived to the present.