Complex sentence: On the eve of Trinity Sunday in that year there was a great storm and flood, the water in the church rose as high as the capitals of the pillars, and in the cloister and other buildings it was six feet deep.
Split into simpler sentences: On the eve of Trinity Sunday in that year, there was a great storm and flood. The water in the church rose as high as the capitals of the pillars, and in the cloister and other buildings it was six feet deep.