Complex sentence: The Church suffered damage at the Reformation and the Civil War and was much altered in succeeding centuries, undergoing a drastic "restoration" and re-roofing over the years 1875-1887, which deprived it of most of its ancient furniture and architecture.
Split into simpler sentences: The Church suffered damage at the Reformation and the Civil War and was much altered in succeeding centuries. The church had a drastic "restoration" and re-roofing over the years 1875-1887, which deprived it of most of its ancient furniture and architecture.