Complex sentence: Principal photography for all three films was conducted concurrently in many locations within New Zealand's conservation areas and national parks between 11 October 1999, and 22 December 2000, a period of days.
Split into simpler sentences: Principal photography for all three films was conducted concurrently in many locations within New Zealand's conservation areas and national parks. Filming took place between 11 October 1999 and 22 December 2000, a period of days.