Complex sentence: Sometime after the old chapel had fallen to ruin, the Penal laws were introduced to Ireland, and a Mass rock at the start of the twelve acre lane was used where Catholics worshiped during the Penal times, where the surrounding hills provided lookouts to spot patrols.
Split into simpler sentences: Sometime after the old chapel had fallen to ruin, the Penal laws were introduced to Ireland. And a Mass rock at the start of the twelve acre lane was used where Catholics worshiped during the Penal times, where the surrounding hills provided lookouts to spot patrols.