Complex sentence: The Cathedral of St Andrew, a ruined cathedral in St Andrews, Fife, Scotland, was the seat of the Bishops (later Archbishops) of St Andrews from its foundation in 1158 until it fell into disuse after the Reformation.
Split into simpler sentences: The Cathedral of St Andrew is a ruined cathedral in St Andrews, Fife, Scotland. It was the seat of the Bishops (later Archbishops) of St Andrews from its foundation in 1158 until it fell into disuse after the Reformation.