Complex sentence: The tz database is also known as tzdata, the zoneinfo database or IANA time zone database, and occasionally as the Olson database, referring to the founding contributor, Arthur David Olson.
Split into simpler sentences: The tz database is also known as tzdata, the zoneinfo database or IANA time zone database. It is sometimes called the Olson database, referring to the founding contributor, Arthur David Olson.