Complex sentence: Two years after the church was consecrated, in 1863, St Pancras was the target of an anti-Catholic riot that led to the curate barricading himself himself in the presbytery for two days.
Split into simpler sentences: Two years after the church was consecrated, in 1863, St Pancras was the target of an anti-Catholic riot. This led to the curate barricading himself himself in the presbytery for two days.