Complex sentence: Moreover, the economic "snapshot" that the benchmark version of the tables provides of the economy's cross-section is typically taken only once every few years, at best, although many developed countries estimate input-output accounts annually and with much greater recency.
Split into simpler sentences: Moreover, the economic "snapshot" that the benchmark version of the tables provides of the economy's cross-section is typically taken only once every few years, at best. However, many developed countries estimate input-output accounts annually and with much greater recency.