Complex sentence: Since its arrival in the Netherlands it has been on display only twice; the most recent time was from 19 December 2008 until 23 February 2009 in the National Museum of Natural History "Naturalis" in Leiden, the Netherlands.
Split into simpler sentences: Since its arrival in the Netherlands it has been only been two times on display. The last time it was on display was from 19 December 2008 until 23 February 2009 in the National Museum of Natural History "Naturalis" in Leiden, the Netherlands.