Complex sentence: The building is a massive block, eleven bays by seven, with giant pilasters of the composite order above the ground floor, slightly projecting their bay centre, with a triangular pediment above on paired pilasters.
Split into simpler sentences: The building is a massive block, eleven bays by seven, with giant pilasters of the composite order above the ground floor. Slightly projecting there bay centre, with a triangular pediment above on paired pilasters.